IBM IntelliStation A Pro 6224 Hardware Maintenance Manual And Troubleshooting Manual page 81

Note: The illustrations in this document might differ slightly from your hardware.
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Figure 32. Removing the power supply
5. Remove the four screws that secure the power supply to the chassis.
6. Lift the power supply out of the chassis, disengaging it from the two connectors.
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Chapter 5. Field replaceable units