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Long story short my computer has the following symptoms:

  • The whole computer stopped working in inactive mode when the screen had turned off. It didn't react to mouse movements or keyboard buttons.
  • The power button didn't work, nothing happened when I held it in for several seconds. I had to turn off the computer with the PSU power button.
  • Afterwards the computer refuses to POST or load BIOS.
  • Some times the computer won't start until it's been disconnected from the power cable for some minutes.

What IS working:

  • Fans are running and MB is lit up when the computer is started.
  • Never had any high temperatures with this hardware.
  • Power button works fine when starting the computer.

Hardware:

  • Motherboard: Gigabyte GA-990 XA UD3
  • Power supply: XFX Pro 1250w
  • Can't find any extra PSU lying around.

What I've tried:

  • All peripherals, graphics card, hard drives and RAM have been unplugged, doesn't change anything.
  • CPU has been reseated, no change.
  • CMOS replaced and reset, no change.

Question: Do I need a new motherboard?

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  • Do you have the option to try a new PSU?
    – DrZoo
    Commented Dec 23, 2017 at 1:21
  • No, unfortunately I can't find any extra PSU'a lying around
    – Berit Larsen
    Commented Dec 23, 2017 at 10:40
  • Does the power button work to turn on the computer? After you disconnect the power for a bit of time when it is reconnected does the computer immediately start or does it only start when you press the power button. Might be a bad power button (dead in the closed position if the computer immediately starts when power is applied).
    – RudyB
    Commented Dec 23, 2017 at 10:51
  • The power button works fine when starting the computer. I also suspect that all the symptoms are connected, and a dead power button would not explain why the computer froze in inactive mode.
    – Berit Larsen
    Commented Dec 23, 2017 at 11:19

1 Answer 1

Reset to default
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After disassembling -everything- and putting it back together, suddenly everything works again. I still have noe idea why it stopped working, or why it works again.

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