Question Problem with computer failing to boot for couple hours

Sep 24, 2020
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My computer turns off randomly (Even with UPS installed) then continuously reboot for 2 seconds before turning itself off. I only hear fans and HDDs starting then PC turns off like it lost power

I just can't figure out what's causing this problem, this can't be power problem since I installed UPS, and it starts working normally after leaving it unplugged for couple hours. I tried swapping RAM and removed Hard drives but still no improvement

I'm suspecting this is either motherboard or CPU problem, but I can't figure out which part is causing problem so I hesistant to swap my parts

Can anyone help me with this bizarre situation?
 

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