Dell OptiPlex 780 Service Manual download (Page 3 of 74)

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Manual type:Service Manual
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Page 3 of 74
The procedures in this document may require the following tools:
Small flat-blade screwdriver
Phillips screwdriver
Small plastic scribe
Flash BIOS update program CD (see the Dell Support website at
Turning Off Your Computer
To avoid losing data, save and close all open files and exit all open programs before you turn off
your computer.
1. Shut down the operating system:
In Windows Vista®:
then click the arrow in the lower-right corner of the
menu as shown below, and then click
Shut Down
In Windows® XP:
Turn Off Computer
Turn Off
The computer turns off after the operating system shutdown process is complete.
2. Ensure that the computer and all attached devices are turned off. If your computer and attached devices did not
automatically turn off when you shut down your operating system, press and hold the power button for about 6
seconds to turn them off.
After Working Inside Your Computer
After you complete any replacement procedure, ensure you connect any external devices, cards, and cables before turning on
your computer.
1. Replace the
To connect a network cable, first plug the cable into the network device and then plug it into the
2. Connect any telephone or network cables to your computer.
3. Connect your computer and all attached devices to their electrical outlets.
4. Turn on your computer.
5. Verify that the computer works correctly by running the Dell Diagnostics. See
Dell Diagnostics
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