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Computer turns on and then off immediately, worked fine day before.

Everything was working fine yesterday, and I turned off the computer like I always do, but this morning I tried to turn it on and all I heard was a click and it was off again. Power is fine. Only visible difference is the reset button on the motherboard now lighting up. I don't want to reset everything without knowing what the problem might be, so any possible solutions would be much appreciated. Thanks.
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  1. Best answer
    Test the power supply. That's the most likely problem.

    Paperclip test: https://www.youtube.com/watch?v=ixcWCrYpw3Y

    Manual test: https://www.youtube.com/watch?v=ac7YMUcMjbw
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