Dell OptiPlex 7090 Service Manual page 61

Steps
1. Align and lower the system board into the system until the stand-off points at the back of the system board align with those
on the chassis.
2. Replace the four screws (6-32) and the single standoff screw (M2X4) screw to secure the system board to the chassis.
3. Connect the following cables to the respective connectors on the system board:
● Intrusion switch
● ATX system board power supply cables
● Power button switch
● ATX CPU power supply cable
● SATA data cables
Removing and installing components 61