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Computer turning on and off repeatedly

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  • Computers
  • Fan
  • Systems
Last response: in Systems
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April 19, 2013 10:40:23 PM

My computer was working fine yesterday, and today when I was trying to turn it on, the fan will spin for about half a second, then it turns off. After a second or so, without me touching anything, it will turn back on, then off again, for about 5 times, then after 5 times, it will show the POST screen, then turn off, then on again. What could be causing this ?
My specs are :
GA-P67-UD3-B3
i5 2500k @ 4.5GHz
RAM 32 GB
HD 7970 OC @ 1125/1500 MHz stock voltage
an unknown brand of 700W PSU

More about : computer turning repeatedly

April 19, 2013 11:13:15 PM

What cooler are you using? Chances are you have it installed incorrectly and it could be causing something to short out.

Your power supply could also be a problem. Try replacing it with a Seasonic or Corsair if you have the money.

You could also try running your system on default settings and see what that does.
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April 19, 2013 11:36:34 PM

Prime suspect would be the mystery power supply.
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April 20, 2013 12:32:06 AM

g-unit1111 said:
What cooler are you using? Chances are you have it installed incorrectly and it could be causing something to short out.

Your power supply could also be a problem. Try replacing it with a Seasonic or Corsair if you have the money.

You could also try running your system on default settings and see what that does.


I've tried taking out the battery on the motherboard and it's still the same. (I suppose taking it out and leaving for 20 minutes will reset all the overclock right ?)
And i've tried to unplug all fan, and still same result.
Oh, and I forgot to mention that every time I tried to RESTART my computer, it will BSOD saying KMODE_EXCEPTION_NOT_HANDLED (windows 8).
And, every time I want to SHUT DOWN my computer, even after the display turns off, the fan will keep spinning until I unplug it from the power
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April 20, 2013 4:16:28 AM

UNKOWN PSU....that may be your culprit there. Check your UPS / Surge protector for functionality and if you can, get a PSU swap to see if that helps. Other than that, just try the easy stuff of removing the RAM/ GPU and see if that helps.
But that last bit about the haunted fan that keeps spinning...it seems very likely to be a PSU issue. You may want to look into you BIOS for power management issues as well, ensure voltages are within the required ranges.
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April 20, 2013 5:11:47 AM

cyder said:
UNKOWN PSU....that may be your culprit there. Check your UPS / Surge protector for functionality and if you can, get a PSU swap to see if that helps. Other than that, just try the easy stuff of removing the RAM/ GPU and see if that helps.
But that last bit about the haunted fan that keeps spinning...it seems very likely to be a PSU issue. You may want to look into you BIOS for power management issues as well, ensure voltages are within the required ranges.


I only able to look to the BIOS first screen for a second before my computer turns back off

Removing RAM and GPU. Still the same result. ( At least I swapped my GPU with HD 6670, because without it I can't plug my monitor)

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April 20, 2013 1:34:28 PM

Your PSU probably got overloaded yesterday and hence after a proper cooldown isn't going to wake up again. If anything was overclocked that may have also done the trick. No way to tell unless you've got an extra power supply handy
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