My computer won't turn on
Check the obvious first! Look to make sure you connected the power cable to the back of your power supply and to your electrical outlet.
If that doesn't fix the problem, check to ensure that you plugged the power supply's 24-pin power plug into the motherboard.
If you still don't get any juice, you either have a bad power supply or a bad motherboard. Return both items and try again when they come in.
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