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I left my pc open last night. When I woke up, I noticed that it's not responding (I'm not sure if it was on or off when I woke up). Pressed the power button - and the lights turned on but nothing appeared on the screen (fans weren't working).

I opened my computer box and disconnected the power supply from the motherboard, removed RAM cards, disconnected the hardrives and removed the small motherboard battery. Cleaned my computer from dust with a fan and reconnected everything.

The computers lights and fans were working fine but it now turns off every like, 5 seconds, nothing appear on the screen. I tried moving the RAM cards to different slots, removing and inserting the motherboard (GA-B75M-D3V) battery a few times... disconnected the power supply cables from the motherboard. Still that same problem. What might be the problem?

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    I would suggest that your power supply has failed.
    – techturtle
    Commented Nov 16, 2017 at 13:35
  • i bought it like not more than 2 years ago :X
    – Rick Sanchez
    Commented Nov 16, 2017 at 13:41
  • If you have another PSU, perhaps you could swap it out to test? It isn't unheard of to have a PSU go out that quickly, it could be defective. Typically defects would show up sooner depending on usage. I think checking the PSU would be the best first troubleshooting step, just as @techturtle said. If the PSU isn't the problem, it is probably a motherboard issue since the motherboard isn't functioning. You may have to swap out the motherboard.
    – David
    Commented Nov 16, 2017 at 13:48
  • I have a weaker power supply somewhere at home but i remember i had the same or similar problem with it 2 years ago, which is why i decided to buy a new one.
    – Rick Sanchez
    Commented Nov 16, 2017 at 13:52
  • @David I connected my old 650 PSU, and it worked, i swapped back to my regular 750 PSU, and it's working now. What just happened? I still have warranty on it, should i go and replace it from where i bought it?
    – Rick Sanchez
    Commented Nov 16, 2017 at 14:06

1 Answer 1

Reset to default
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On BIOS Setup you should check CPU temperature. By default motherboards are configured for shutdown when a defined CPU temperature limit is reached.

You could find some reference here: CPU Temperature required for auto-shutdown

Sometimes when the computer has been off for a long time this period (5 seconds) tends to be longer.

This two videos could give you some guidance in this issue:

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  • my computer doesn't turn on dude.
    – Rick Sanchez
    Commented Nov 16, 2017 at 13:53
  • "it now turns off every like, 5 seconds" to turn off it has to be on first. When you say it doesn't turns on you mean doesn't shows nothing on screen or doesn't turns on at all?
    – ppdmartell
    Commented Nov 16, 2017 at 14:04

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