Which piece of hardware is failing?

My PC keeps shutting off and refuses to boot back up. It powers up, so it isnt the power supply. Sometimes the bios will load but the system will not. Other times the pc will just power on but nothing, not even bios, will load. So is it the hardrive, mobo, or cpu?

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Clarification Request
Some info about machine/OS would help.


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That's not a sign that it's not the PSU.

I guess there are a lot of new techs out there. You can rule out the HDD by unplugging that. It's not needed during testing.

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need computer model

if the bios will not load, then replace the battery on the motherboard.

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