Dell Studio One 19 (1909, Early 2009) - Manual (Page 31)

Replacing the Power Supply Unit
1. Follow the procedures in Before You Begin .
2. Replace the four screws that secure the power supply unit to the chassis.
3. Connect the power supply unit cable to the connector (ATX_POWER1) on the system board.
4. Connect the power plug cable to the power supply unit.
5. Replace the stand (see Replacing the Stand ).
6. Replace the shield (see Replacing the Shield ).
7. Replace the computer cover (see Replacing the Computer Cover ).
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WARNING: Ensure that the protective grounding cable screw is secure.