CompTIA A+ | Microsoft MTA O/S: How To Install a Power Supply
Source Learning About Computers
To install a power supply is really quite easy. It fits in the top back of the case. First, orient the holes on the power supply to those on the case.
Then, place the unit in the space provided and slide it in until the screw holes are aligned.
Secure it by screwing it in.
Finally, plug the power connector into the motherboard. It connects one way.
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