Replacing The System Board - Dell Dimension 8400 Service Manual

2. Open the computer cover.
3. Remove any components that restrict access to the system board.
4. Disconnect all cables from the system board.
5. Before you remove the existing system board assembly, visually compare the replacement system board to the existing system board to make sure that
you have the correct part.
6. Remove the system board screw.
7. Pull up on the two tabs, slide the system board assembly toward the front of the computer, and then lift the asembly up and away.
8. Place the system board assembly that you just removed next to the replacement system board.

Replacing the System Board

1. Transfer components from the existing system board to the replacement system board:
a. Remove the memory modules
b. Install them on the replacement board.
CAUTION: The processor package and heat-sink assembly can get hot. To avoid burns, ensure that the package and assembly have had sufficient
time to cool before you touch them.
c. Remove the heat-sink assembly and processor
2. Configure the settings of the replacement system board.
3. Set the jumpers on the replacement system board so they are identical to the ones on the existing board.
NOTE: Some components and connectors on the replacement system board may be in different locations than the corresponding connectors on the
existing system board.
4. Orient the replacement board by aligning the notches on the bottom of the board with the tabs on the computer.
5. Slide the system board assembly toward the back of the computer until the assembly clicks into position.
6. Replace any components and cables that you removed from the system board.
7. Reconnect all cables to their connectors at the back of the computer.
8. 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.
and install them on the replacement board.
from the existing system board and transfer them to the replacement system board.