Dell OptiPlex E1 - Manual (Page 57)

Removing and Replacing Parts 4-11
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To remove the system power supply, follow these steps:
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When you replace the system power supply, place it down inside the chassis
and against the right side of the chassis. Then slide the system power supply
toward the back of the chassis, and hook the tabs into the right side of the
power supply.
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power supply
power-supply
mounting screw