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How Was the Computer Invented and When

Imagine the world without computers. You’d have no internet to help you with your homework, and just think of all that post, photocopying and filing.

The first computer was invented in 1834, long before TV, telephones and even electricity. The inventor, Charles Babbage, called his computer the Difference Engine. It was essentially a calculator and since there was no electricity, it was mechanical. And very complicated.

In fact he never quite managed to finish it. Babbage spent a further 37 years designing the Analytical Engine, a pre-cursor to the first working general-purpose computers.

Computers really got going in the 20th century: Konrad Zuse’s Z3 was the first programmable computer, invented in 1941.

The Colossus computer was the first completely electronic computer. It was used to crack German codes during the Second World War.

By the end of the 1950s computers had become smaller and cheaper. (They were still about the size of a double-decker bus, though.)

Microprocessors, programmable components measuring just a few millimetres, were invented by Intel employee Ted Hoff in 1971. Just one of them was as powerful as the huge 30-tonne computers of the 1940s.

By the 1980s computers were small and cheap enough for individuals to buy and use at home. And today, computers are everywhere and most modern electronic devices, from washing machines to cars, contain one.

Finished Engine: Although Charles Babbage never completed the Difference Engine himself, the Science Museum in London did manage to build one in 1991, to mark the 200th anniversary of Babbage’s birth. And it worked!

Computers have taken over almost all aspects of our lives, from schoolwork and homework to keeping in touch with your friends. But not so long ago computers didn’t even exist.

Can you live without using one for at least a week? Sign the declaration and see if you have the will power to give it up.

I DECLARE: BY SIGNING THIS FORM I AGREE TO LIVE ONE WHOLE WEEK WITHOUT USING A COMPUTER AT ALL. HOWEVER TEMPTED I MAY BE, I VOW NOT TO TOUCH ONE.

The answer to this question depends of your definition of a computer.

The first known counting devices or tools were Tally Sticks from about 35,000 BC.

The Abacus was then invented by the Babylonians in 2400 BC.

In 1837, Charles Babbage, a British professor of mathematics described his idea for the Analytical Engine, the first stored-program mechanical computer. The Analytical Engine was designed to be powered by a steam engine and was to use Punched Cards, which was used to program mechanical looms at the time.

What made the Analytical Engine unique was that it was designed to be programmed.

It was because of this and the fact that it would be more than 100 years that any similar devices would be constructed, Charles Babbage, would be considered by many as the “father of computing”. Because of legal, financial, and political obstacles, the Analytical Machine would never be completed. Charles Babbage was also difficult to work with and alienated the supporters of his work.

In 1939, John V. Atanasoff and Clifford Berry developed the Atanasoff-Berry Computer (ABC) at Iowa State University, which was regarded as the first electronic digital computer. The ABC was built by hand and the design used over 300 Vacuum Tubes and had capacitors fixed in a mechanically rotating drum for memory.

The ENIAC (Electronic Numerical Integrator and Computer), constructed in the US in 1943, is widely regarded as the first functionally useful electronic general-purpose computer. Influenced by the ABC, it was a turning point in the history of computing and was used to perform ballistics trajectory calculations and used 160 kW of power. World War II is known to be the driving force of computing hardware development and one of such use of computers was in communications encryption and decryption.

The UNIVAC I (Universal Automatic Computer) was the first commercially available, “mass produced” electronic computer manufactured by Remington Rand in the USA and was delivered to the US Census Bureau in June 1951. It used 5,200 vacuum tubes and consumed 125 kW of power. 46 machines were sold at more than $1 million each.

The microprocessor eventually led to the development of the microcomputer, small, low-cost computers that individuals and small businesses could afford.

By the 1990s, the microcomputer or Personal Computer (PC) became a common household appliance, and became even more widespread with the advent of the Internet.

Why is a Computer Problem Called a “Bug” And Where Did the Term Originate

Grace Hopper led the team that developed the first large-scale computer for the American Navy in 1945.

After troubleshooting an unexplained problem for days, they finally found the cause to be a two-inch bug, a moth, that had gotten stuck in the relay system.

And that’s how the term bug was coined.

From then on, all unexplained computer problems were called bugs.

Who Invented the First Computer Mouse and How Did It Get Its Name

The first computer mouse was given its name by the device’s inventor, Douglas Engelbart.

Because, for some reason, the “X-Y Position Indicator for a Display System” just didn’t catch on.

The first users hated the clumsiness of the name and quickly dubbed them “turtles,” which eventually became “rodent,” which morphed into the cuter-sounding “mouse.”

This name was just right for the shape and size of the X-Y Position Indicator, and it stuck.

These days, mice are sophisticated devices that have many buttons. Some are cordless, and more recently, have no balls for tracking. Instead, a low power laser is used to track the surface it sits on.

The advantage? We no longer have to remove the ball from the poor mouse and clean the rollers so our mouse works like new again.

Tools to Fix An Infected Computer 12in1 . The collection includes:
1. Autoruns fix
2. Freecommander
3. Process Explorer
4. Promast

5. Run
6. Runscanner
7. Gs
8. isreset
9. regalyz
10. Tasklist
11. Combo fix
12. Task manager fix

DOWNLOAD LINK

How to Download All Apps from Google Play Store to Computer in HD Video Tutorial By XPCMasti.blogspot.com

Boost your Computer Speed with just One Click of a button By XPCMasti.blogspot.com

Every now and then our computers get half or slow down that we cannot perform any task which really irritates us.

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.

CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.

Follow the procedures in "Before You Begin."
Remove the computer stand, if it is attached.
If you have installed a padlock through the padlock ring on the back panel, remove the padlock.

NOTICE: Ensure that there is sufficient space to support the open cover—at least 30 cm (1 ft.) of desk top space.

Locate the two release buttons shown in the illustration. Then press the two release buttons as you lift the cover.

NOTICE: Open the cover slowly to ensure that you do not damage any cables.

Raise the back of the cover, and pivot it toward the front of the computer.

1	security cable slot
2	padlock ring
3	release buttons (one on each side)

Front View

1	front-panel door	Open the door to use the front-panel connectors.
2	headphone connector	Use the headphone connector to attach headphones and most kinds of speakers.
3	USB 2.0 connectors (2)	Use the front USB connectors for devices that you connect occasionally, such as joysticks or cameras, or for bootable USB devices (see "System Setup" for more information about booting to a USB device). It is recommended that you use the back USB connectors for devices that typically remain connected, such as printers and keyboards.
4	CD/DVD drive eject button	Press to eject a CD or DVD from the drive.
5	floppy-drive eject button	Press to eject a floppy disk from the floppy drive.
6	floppy-drive activity light	The floppy drive light is on when the computer reads data from or writes data to the floppy drive. Wait until this light turns off before you remove the floppy disk from the drive.
7	hard-drive activity light	The hard drive light is on when the computer reads data from or writes data to the hard drive. The light might also be on when a device such as your CD player is operating.
8	power button	Press to turn on the computer. NOTICE: To avoid losing data, do not turn off the computer by pressing the power button for 6 seconds or longer. Instead, perform an operating system shutdown. NOTICE: If your operating system has ACPI enabled, when you press the power button the computer will perform an operating system shutdown.
9	power light	The power light illuminates and blinks or remains solid to indicate different states: No light — The computer is turned off. (S4, S5, or mechanical OFF) Steady green — The computer is in a normal operating state. Blinking green — The computer is in a power-saving state. (S1 or S3) Blinking or solid amber — See "Power Problems." To exit from a power-saving state, press the power button or use the keyboard or the mouse if it is configured as a wake device in the Windows Device Manager. For more information about sleep states and exiting from a power-saving state, see "Power Management." See "Diagnostic Lights" for a description of light codes that can help you troubleshoot problems with your computer.
10	front-panel door	Open the door to use the front-panel connectors.

Back View

1	back panel connectors	Plug serial, USB, and other devices into the appropriate connector.
2	security cable slot	Use a security cable with the slot to help secure your computer.
3	padlock ring	Insert a padlock to lock the computer cover.
4	card slots	Access connectors for any installed PCI and PCI Express cards.
5	voltage selection switch (may not be available on all computers)	Your computer is equipped with either an auto-sensing voltage selector or a manual voltage selection switch. Computers with an auto-sensing voltage selector do not have a voltage selection switch on the back panel and can automatically detect the correct operating voltage. To help avoid damaging a computer with a manual voltage selection switch, set the switch for the voltage that most closely matches the AC power available in your location. NOTICE: The voltage selection switch must be set to the 115-V position even though the AC power available in Japan is 100 V. Also, ensure that your monitor and attached devices are electrically rated to operate with the AC power available in your location.
6	power connector	Insert the power cable.

1	serial connector	Connect a serial device, such as a handheld device, to the serial port. The default designations are COM1 for serial connector 1 and COM2 for serial connector 2. For more information, see "System Setup Options."
2	link integrity light	Green — A good connection exists between a 10-Mbps network and the computer. Orange — A good connection exists between a 100-Mbps network and the computer. Yellow — A good connection exists between a 1-Gbps (or 1000-Mbps) network and the computer. Off — The computer is not detecting a physical connection to the network.
3	network adapter connector	To attach your computer to a network or broadband device, connect one end of a network cable to either a network jack or your network or broadband device. Connect the other end of the network cable to the network adapter connector on the back panel of your computer. A click indicates that the network cable has been securely attached. NOTE: Do not plug a telephone cable into the network connector. On computers with a network connector card, use the connector on the card. It is recommended that you use Category 5 wiring and connectors for your network. If you must use Category 3 wiring, force the network speed to 10 Mbps to ensure reliable operation.
4	network activity light	Flashes a yellow light when the computer is transmitting or receiving network data. A high volume of network traffic may make this light appear to be in a steady "on" state.
5	line-in connector	Use the blue line-in connector (available on computers with integrated sound) to attach a record/playback device such as a cassette player, CD player, or VCR. On computers with a sound card, use the connector on the card.
6	line-out connector	Use the green line-out connector (available on computers with integrated sound) to attach headphones and most speakers with integrated amplifiers. On computers with a sound card, use the connector on the card.
7	microphone connector	Use the pink microphone connector (available on computers with integrated sound) to attach a personal computer microphone for voice or musical input into a sound or telephony program. On computers with a sound card, the microphone connector is on the card.
8	USB 2.0 connectors (6)	Use the back USB connectors for devices that typically remain connected, such as printers and keyboards. It is recommended that you use the front USB connectors for devices that you connect occasionally, such as joysticks or cameras, or for bootable USB devices.
9	diagnostic lights	Use the lights to help you troubleshoot a computer problem based on the diagnostic code. For more information, see "Diagnostic Lights."
10	video connector	Plug the cable from your VGA-compatible monitor into the blue connector. NOTE: If you purchased an optional graphics card, this connector will be covered by a cap. Connect your monitor to the connector on the graphics card. Do not remove the cap. NOTE: If you are using a graphics card that supports dual monitors, use the y-cable that came with your computer.
11	parallel connector	Connect a parallel device, such as a printer, to the parallel connector. If you have a USB printer, plug it into a USB connector. NOTE: The integrated parallel connector is automatically disabled if the computer detects an installed card containing a parallel connector configured to the same address. For more information, see "System Setup Options."

Inside Your Computer

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.

CAUTION: To avoid electrical shock, always unplug your computer from the electrical outlet before opening the cover.

NOTICE: Be careful when opening the computer cover to ensure that you do not accidentally disconnect cables from the system board.

1	hard drive	6	padlock ring
2	chassis intrusion switch	7	heat sink and blower assembly
3	internal speaker	8	system board
4	power supply	9	floppy drive
5	card cage	10	CD/DVD drive

System Board Components

1	RTC reset jumper (RTCRST)	14	front-panel audio cable connector (FRONTAUDIO)
2	power connector (POWER)	15	line-in, line-out, and microphone connectors (AUDIO)
3	floppy drive connector (DSKT)	16	network connector (NIC) and USB connector (USB2)
4	battery socket (BATTERY)	17	USB connectors (USB1)
5	internal speaker (SPEAKER)	18	diagnostic lights (DIAG LED)
6	front-panel connector (FRONT PANEL)	19	serial port connector (SER1) and video connector (VGA)
7	CD/DVD drive connector (IDE)	20	parallel port connector (PAR)
8	serial ATA drive 0 connector (SATA0)	21	power connector (12VPOWER)
9	standby power light (AUX_PWR)	22	processor connector (CPU)
10	memory module connectors (DIMM1, DIMM2, DIMM3, DIMM4)	23	heat-sink/blower retention pad
11	PCI Express x16 connector (PEG)	24	fan connector (FAN)
12	PCI riser connector (PCI2)	25	serial port 2 connector (SER_PS2)
13	CD drive analog audio cable connector for optional analog audio cable (CD_IN)	26	password jumper (PSWD)

Attaching and Removing the Computer Stand

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.

NOTE: Place your computer on a soft surface to prevent scratching the top cover.

Your computer can be used in either a vertical or horizontal position.

To use the computer in a vertical position, you must attach the computer stand:

Place the computer on its right side so that the drive bays are at the bottom.
Fit the stand onto what was the left side of the computer:
1. Position the stand as shown in the following illustration by aligning the large round hole in the stand with the securing button on the side of the cover and aligning the captive screw in the stand with the screw hole in the cover.
1. When the stand is in place, tighten the thumbscrew.
Rotate the computer so that the stand is at the bottom and the drives are at the top.

Remote Computer Manager 6.0.4

Remote Computer Manager is a network utility for remote computer management. The program allow network administrators to centrally manage network PCs and make: remote shutdown, run (execute) commands, launch applications and processes, Wake-on-LAN over IPv4, Wake on LAN over IPv6, lock workstation, log on, log off, sleep, hibernate, wake up, reboot, power on, power off, lock and unlock input devices, registry merge, file copy, installation of MSI packages, clock (time) synchronization and other remote operations for computers on network (Windows and Linux PCs). Using Remote Computer Manager you can perform a remote shutdown, power on (turn on), power off (turn off) and restart (reset) the remote computer with Intel AMT (Active Management Technology) and AMD DASH (Desktop and Mobile Architecture for System Hardware).

The program can also get the list of remote processes and services, netstat information, screenshot, entries from registry, entries from event log and other details for each PC. Using the application you can make remote operations on one or multiple network computers with one click. Remote operations can be executed automatically according with defined schedule, so you can organize fully automatic computer management for your company. The software supports IPv4 and IPv6 protocol and can be run as a service.

Remote Computrer Manager has the following features:

Actions with processes (Get list, create, terminate process) on remote computers.

Operations with services (Get list, install and uninstall, start and stop service) on LAN PCs.

View registry of network PCs.

Browse event log of network computers.

Remote command prompt.

Launch (execute) applications and files on remote PCs.

Taking netstat information of remote computers.

Taking screenshots of network PCs.

File operations (send file, get file, copy file, move file, rename file and delete file) on LAN computers.

Actions with registry (create key, add/edit value) on network PCs.

Merge registry files with the registry of network computers.

Installation of MSI packages on remote PCs.

Remote shutdown, reboot, power off with DCOM and WMI for Windows PCs.

Remote reboot, shutdown, power off with SSH for Linux PCs.

Turn on, shutdown, reboot, turn off network computers with Intel AMT (vPro) and AMD DASH.

Wake on LAN over IPv4 and IPv6.

Wake up network computers with magic packet.

Switching network PCs into sleep and hibernate state.

Logon and logoff users on remote computers.

Lock workstation, lock and unlock input devices on network PCs.

Send message to network computers.

Browse files of LAN computers.

Time zone and time synchronization on remote PCs.

What Was Considered a Computer Before the Electronic Age and How Much Did It Cost

The word computer first appeared in the seventeenth century as the job title of a person who did calculations as an occupation.

Most human computers weren’t paid very much, just like the Information Technology workers of today, even though their job descriptions are slightly different.

Although slide rules were sometimes called computers, it wasn’t until the 1940s, with the development of massive electronic data machines, that the human occupation of computing became obsolete.

These mechanical devices became known as computers.

Front View

1	CD/DVD-drive eject button	Press to eject a CD or DVD from the drive.
2	hard-drive activity light	The hard drive light is on when the computer reads data from or writes data to the hard drive. The light might also be on when a device such as your CD player is operating.
3	front-panel door	Open the door to use the front panel connectors. NOTE: The front door is removable; if you remove it or accidentally knock it off its hinges, it snaps back in place. For instructions on how to reattach the door, see "Front-Panel Door and Hinge Arms."
4	front air vents	The front air vents help cool the inside of your computer.
5	headphone connector	Use the headphone connector to attach headphones and most kinds of speakers.
6	USB 2.0 connectors (2)	Use the front USB connectors for devices that you connect occasionally, such as joysticks or cameras, or for bootable USB devices (see "System Setup" for more information on booting to a USB device). It is recommended that you use the back USB connectors for devices that typically remain connected, such as printers and keyboards.
7	power button	Press to turn on the computer. NOTICE: To avoid losing data, do not turn off the computer by pressing the power button for 6 seconds or longer. Instead, perform an operating system shutdown. NOTICE: If your operating system has ACPI enabled, when you press the power button the computer will perform an operating system shutdown.
8	power light	The power light illuminates and blinks or remains solid to indicate different states: No light — The computer is turned off (S4, S5, or mechanical OFF) Steady green — The computer is in a normal operating state Blinking green — The computer is in a power-saving state (S1 or S3) Blinking or solid amber — See "Power Problems" To exit from a power-saving state, press the power button or use the keyboard or the mouse if it is configured as a wake device in the Windows Device Manager. For more information about sleep states and exiting from a power-saving state, see "Power Management." See "Diagnostic Lights" for a description of light codes that can help you troubleshoot problems with your computer.
9	floppy-drive activity light	The floppy drive light is on when the computer reads data from or writes data to the floppy drive. Wait until this light turns off before you remove the floppy disk from the drive.
10	floppy-drive eject button	Press to eject a floppy disk from the floppy drive.

Back View

1	power connector	Insert the power cable.
2	voltage selection switch (may not be available on all computers)	Your computer is equipped with either an auto-sensing voltage selector or a manual voltage selection switch. Computers with an auto-sensing voltage selector do not have a voltage selection switch on the back panel and can automatically detect the correct operating voltage. To help avoid damaging a computer with a manual voltage selection switch, set the switch for the voltage that most closely matches the AC power available in your location. NOTICE: The voltage selection switch must be set to the 115-V position even though the AC power available in Japan is 100 V. Also, ensure that your monitor and attached devices are electrically rated to operate with the AC power available in your location.
3	back panel connectors	Plug serial, USB, and other devices into the appropriate connector.
4	card slots	Access connectors for any installed PCI and PCI Express cards.

1	serial connector	Connect a serial device, such as a handheld device, to the serial port. The default designations are COM1 for serial connector 1 and COM2 for serial connector 2. For more information, see "System Setup Options."
2	link integrity light	Green — A good connection exists between a 10-Mbps network and the computer. Orange — A good connection exists between a 100-Mbps network and the computer. Yellow — A good connection exists between a 1-Gbps (or 1000-Mbps) network and the computer. Off — The computer is not detecting a physical connection to the network.
3	network adapter connector	To attach your computer to a network or broadband device, connect one end of a network cable to either a network jack or your network or broadband device. Connect the other end of the network cable to the network adapter connector on the back panel of your computer. A click indicates that the network cable has been securely attached. NOTE: Do not plug a telephone cable into the network connector. On computers with a network connector card, use the connector on the card. It is recommended that you use Category 5 wiring and connectors for your network. If you must use Category 3 wiring, force the network speed to 10 Mbps to ensure reliable operation.
4	network activity light	Flashes a yellow light when the computer is transmitting or receiving network data. A high volume of network traffic may make this light appear to be in a steady "on" state.
5	line-in connector	Use the blue line-in connector (available on computers with integrated sound) to attach a record/playback device such as a cassette player, CD player, or VCR. On computers with a sound card, use the connector on the card.
6	line-out connector	Use the green line-out connector (available on computers with integrated sound) to attach headphones and most speakers with integrated amplifiers. On computers with a sound card, use the connector on the card.
7	microphone connector	Use the pink microphone connector (available on computers with integrated sound) to attach a personal computer microphone for voice or musical input into a sound or telephony program. On computers with a sound card, the microphone connector is on the card.
8	USB 2.0 connectors (6)	Use the back USB connectors for devices that typically remain connected, such as printers and keyboards. It is recommended that you use the front USB connectors for devices that you connect occasionally, such as joysticks or cameras, or for bootable USB devices.
9	diagnostic lights	Use the lights to help you troubleshoot a computer problem based on the diagnostic code. For more information, see "Diagnostic Lights."
10	video connector	Plug the cable from your VGA-compatible monitor into the blue connector. NOTE: If you purchased an optional graphics card, this connector will be covered by a cap. Connect your monitor to the connector on the graphics card. Do not remove the cap. NOTE: If you are using a graphics card that supports dual monitors, use the y-cable that came with your computer.
11	parallel connector	Connect a parallel device, such as a printer, to the parallel connector. If you have a USB printer, plug it into a USB connector. NOTE: The integrated parallel connector is automatically disabled if the computer detects an installed card containing a parallel connector configured to the same address. For more information, see "System Setup Options."

Inside Your Computer

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.

CAUTION: To avoid electrical shock, always unplug your computer from the electrical outlet before opening the cover.

NOTICE: Be careful when opening the computer cover to ensure that you do not accidentally disconnect cables from the system board.

1	hard drive	6	heat sink and blower assembly
2	internal speaker	7	power supply
3	chassis intrusion switch	8	floppy drive
4	system board	9	CD/DVD drive
5	padlock ring and security cable slot

System Board Components

1	power connector (POWER)	15	line-in, line-out, and microphone connectors (AUDIO)
2	RTC reset jumper (RTCRST)	16	network connector (NIC) and USB connector (USB2)
3	floppy drive connector (DSKT)	17	USB connectors (USB1)
4	internal speaker (SPEAKER)	18	diagnostic lights (DIAG LED)
5	CD/DVD drive connector (IDE)	19	serial port connector (SER1) and video connector (VGA)
6	front-panel connector (FRONTPANEL)	20	parallel port connector (PAR)
7	serial ATA drive connectors (SATA0, SATA1, SATA2, SATA3)	21	power connector (12VPOWER)
8	standby power light (AUX_PWR)	22	processor connector (CPU)
9	battery socket (BATTERY)	23	heat-sink/blower retention pad
10	PCI Express x16 connector (PEG)	24	fan connector (FAN)
11	PCI connectors (PCI0, PCI1, PCI2)	25	serial port 2 connector (SER_PS2)
12	PCI Express x1 connector (PE1)	26	memory module connectors (DIMM1, DIMM2, DIMM3, DIMM4)
13	CD drive analog audio cable connector for optional analog audio cable (CD_IN)	27	password jumper (PSWD)
14	front-panel audio cable connector (FRONTAUDIO)

Front-Panel Door and Hinge Arms

To prevent damage to your computer, the front-panel door is designed to "break away" if it is lifted up too far. If the front-panel door is open and it is pushed inward too hard, the hinge arms may also break away (the hinge arms are loose when they are detached).

Reattaching the Hinge Arms

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.

Follow the procedures in "Before You Begin."
Disconnect the computer power cable from the electrical outlet.
Remove the front-panel door by gently snapping it off the two hinge arms.
Remove the front-panel insert above the door bay area by pulling the bottom of the insert with your fingers.

1	front-panel insert
2	use fingers to pull here

Lift both hinge arms to the horizontal position.
Use the two view slots to align the pivot bar with the two pivot-bar slots.

1	pivot-bar slots (2)
2	pivot bar
3	hinge arms (2) in horizontal position
4	view slots (2)

NOTICE: Before touching anything inside your computer, ground yourself by touching an unpainted metal surface, such as the metal at the back of the computer. While you work, periodically touch an unpainted metal surface to dissipate any static electricity that could harm internal components.

Pull the arms toward you until they snap into position.

If the hinge arms do not snap back into position on the first attempt, slightly reposition the arms and try again.

After the hinge arms snap into position, lower and raise the arms two or three times to properly seat them.
Reattach the front-panel insert.
Reconnect the computer power cable to the electrical outlet.
Reattach the front door.

Reattaching the Front Door

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.

Follow the procedures in "Before You Begin."
Disconnect the computer power cable from the electrical outlet.
Lower the hinge arms to the vertical position.
Align the two clips on the inside of the front door with the two hinge arms.
Press inward on the front door until it clips to both hinge arms.

1	hinge arms (2) in vertical position
2	front-panel door
3	front-door clips (2)

Download Available

Pages

How Was the Computer Invented and When

Who Invented the First Computer

Why is a Computer Problem Called a “Bug” And Where Did the Term Originate

Who Invented the First Computer Mouse and How Did It Get Its Name

Tools to Fix An Infected Computer 12in1

DOWNLOAD LINK

Tutorial How to Download Apps from Google Play to Computer

Boost your Computer Speed with just One Click of a Button

Dell™ OptiPlex™ Opening the Computer Cover Guide

Dell™ OptiPlex™ About Your Small Desktop Computer Guide

Front View

Back View

Inside Your Computer

System Board Components

Attaching and Removing the Computer Stand

Remote Computer Manager 6 0 4 Reg Key free download

What Was Considered a Computer Before the Electronic Age and How Much Did It Cost

Dell™ OptiPlex™ About Your Tower Computer Guide

Front View

Back View

Inside Your Computer

System Board Components

Front-Panel Door and Hinge Arms

Reattaching the Hinge Arms

Reattaching the Front Door