Dell OptiPlex 390 (Mid 2011) - Manual (Page 51)

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System Board
Removing the System Board
1. Follow the procedures in Before Working Inside Your Computer .
2. Remove the cover .
3. Remove the front bezel .
4. Remove the hard drive .
5. Remove the expansion cards .
6. Remove the heat sink .
7. Disconnect all the cables connected to the system board.
8. Lift and release the expansion-card latch to gain access to the screws
securing the system board.
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