Dell OptiPlex 5090 Service Manual page 62

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
● SATA power cable
● System fan cable
4. Align and lower the I/O panel into the slot on the chassis.
5. Replace the screws (6-32) to secure the I/O panel to the chassis.
Next steps
1. Install the processor.
2. Install the fan assembly.
3. Install the WLAN card.
62 Removing and installing components