Installing The System Board - Dell D31M Owner's Manual

4. Lift the pull tab to open the PCIe door.
5. Remove the seven (6-32) screws that secure the system board to the chassis
6. Remove the three (6-32) M.2 standoff screws that secure the system board to the chassis
7. Lift the system board at an angle and remove the system board off the chassis.

Installing the system board

Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following image indicates the connectors on your system board.
1. ATX CPU power connector
2. ATX CPU power connector
3. Memory module connectors
4. Power button connector
5. SD card reader connector
6. M.2 PCIe SSD connector
7. M.2 PCIe SSD connector
8. SATA0 connector (blue)
9. Two SATA1/2 connector (black)
10. SATA3 connector (white)
11. SATA power cable connector
12. M.2 WLAN connector
13. System power connector
14. Internal speaker connector
15. Coin-cell battery
16. Thunderbolt header
Removing and installing Field Replaceable Units (FRUs) 121