Dell OPTI PLEX GX1, Service Manual

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To remove the system board, follow these steps:
1. Disconnect all cables from their connectors at the back of the computer.
2. Remove the expansion-card cage.
3. Disconnect all cables from the system board.
4. Remove the screw that secures the system board to the bottom of the
chassis.
5. Slide the system board toward the front of the chassis until it stops.
6. Carefully lift the system board out of the chassis (be sure to lift evenly and
not twist the system board).
NOTES: If you are replacing the system board, remove all DIMMs, the
video-memory upgrade module (if present), the single-edge contact (SEC)
cartridge/heat sink assembly, and the guide bracket assembly from the old
system board and install them on the replacement board. Also, set the
jumpers on the new system board so that they are identical to those on the
old board, unless a microprocessor upgrade is being installed.
If the original system board has a NIC connector, ensure that the replacement
board has a NIC connector.
When you reinstall the system board (before you slide the system board back
to lock it in position), push down near each slot to engage the grounding clip
onto its corresponding tab. Push evenly on both sides of the system board as
you slide it into position (do not twist the system board).
screw
slots (5)
tabs (5)