Dell OptiPlex 790 (Early 2011) - Manual (Page 47)

Installing The System Board
1. Align the system board to the port connectors on the rear of the chassis
and place the system board in the chassis.
2. Tighten the 7–mm hex screw securing the system board to the chassis.
3. Tighten the screws securing the system board to the chassis.
4. Close the expansion card latch.
5. Connect the cables to the system board.
6. Connect the intrusion switch cable, SATA cables, Input/Output board cable,
system fan cable, power switch cable, internal speaker cable, and the
power supply cables to the system board.
7. Install the fan shelter .
8. Install the heat sink and processor .
9. Install the expansion card .
10. Install the drive cage .
11. Install the front bezel .
12. Install the cover .
13. Follow the procedures in After Working Inside Your Computer .
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