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Question

PC turns on for like 2 seconds and then turns off by itself

Mar 29, 2018 3:03AM PDT

Hello
I have experienced this problem for the first time like 2 months ago. Sometimes when I work on my PC it out of nowhere says Turning Off, then It turns off and turns on for like 2 seconds and immediately shuts down repeatedly. I have to turn off the power supply button and let it be for some time ( maybe like 1-2 hours) and then It works normally like nothing happened. This does not happen everyday, it happens maybe like once per two weeks. Also sometimes when I wake up in the morning the PC turned on by itself while I was sleeping. Thank you in advance for all your help and answers and excuse my english please, I am not a native english speaker.

Discussion is locked

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Answer
Specs
Mar 29, 2018 3:05AM PDT

Oh and my specs are
Motherboard: ASUS Z77-A
CPU: Intel Core i5-3570K 3.40 GHz
RAM: Kingston HyperX Fury Black 8GB DDR3 1866MHz
HDD:Western Digital Blue 1TB
GPU: MSI R9 270 GAMING 2GB
Mechanic: ASUS DRW-24F1ST černá
PSU: FSP Fortron FSP500-60GHN 500W
OS: Windows 7 Home Premium upgraded to W10

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Could be overheating or PS issues
Mar 29, 2018 6:04AM PDT

It does look like your PS is a single rail type but I didn't look up your GPU needs. Typically, you'll be advised to see if the PC runs OK with the cover off as, if it does, overheating is suspected. If not, you'd be asked if you are overclocking as your CPU with the "K" suffix means it's capable of that. If you OC the PC, try running it normally. You're just starting to rule things out so I'd suggest these things first.

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Answer
Anemic PSU. Only 18A on the +12V rails.
Mar 29, 2018 8:55AM PDT

This sort of PSU might work then cause issues. I'd start with a new PSU as well as start over on the build.

That is start with the bare min parts on cardboard to see if it's OK with the new PSU. Then move to the case after another check to see if any EXTRA MOTHERBOARD MOUNTING POSTS ARE REMOVED.