Dell Dimension 8400 Service Manual page 41

a. Locate the 3-pin CMOS jumper (CLR CMOS)
b. Remove the jumper plug from pins 2 and 3.
c. Place the jumper plug on pins 1 and 2 and wait approximately 5 seconds.
d. Replace the jumper plug on pins 2 and 3.
3. Close the computer cover.
NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.
4. Connect your computer and devices to electrical outlets, and turn them on.
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on the system board.