PC restarts immediately

As soon as I switch my PC on it immediately powers off (as if the powers been cut off) and then restarts on its own 2 seconds later. If I keep the PC plugged in (to the mains) this problem doesn’t occur. When it’s restarted I have no problems. I’ve got an overclocked CPU and even when pushed the system remains stable. Is this a PSU fault? Help please
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More about restarts immediately
  1. looks like the overclock is forcing the cpu to turn off, so the windows removes the overclock and enter normally, isn't that what is happening? do you still with overclocked cpu when enter in windows?
  2. are you talking about a laptop or a desktop?

    if its an asus motherboard the double post is a common problem
  3. Its a desktop and a Gigabyte EX58-UD5 motherboard

    I've used CPU ID tool to the check the overclock, all appears to be okay. Core Speed shows 3800.0MHz
  4. i have a Gigabyte EX58-UD5 and an i7-920 in my second pc thats going on ebay soon now i have a 2600k

    the double post is something to do with overclocking it--cant remember if you have to disable pll overvolting or

    something similar in the bios

    but mine did it for over a year with no problems

    so its nothing to do with your psu
  5. are you sure this is not the stock speed with turbo boost active, probably the cpu overclock is wrong so it reboot and restart to the default overclock?

    try removing the overclock and try again.
  6. ricardois said:
    by any means is it a i7 2600, if yes this is stock speed with turbo boost active, probably the cpu overclock is wrong so it reboot and restart to the default overclock?

    try removing the overclock and try again.


    its not a i7 2600 he has because thats an x58 chipset so its a i7-920 or i7-950 etc cpu
  7. mcnumpty23 said:
    its not a i7 2600 he has because thats an x58 chipset so its a i7-920 or i7-950 etc cpu


    i edited just after i've posted it xD didn't read the motherboard/cpu.

    still, remove the overclock and test if the problem remains.
  8. I had this kinda problem, computer kept booting up even though I hitted shutdown.

    Replaced the PSU and all is good again. Old PSU was 150€+ "quality" and still it gave up on me on the pribe age of 4. (bought 2008)
  9. Thanks for everybodys help, I will rollback the CPU to its stock clock speeds as soon as I can. I'll let you know the outcome asap, thanks again!
  10. I'm not sure that removing the overlcock will change anything. I removed the PC from the mains, reconnected, then restarted the PC. The PC started, immediately stopped and then started on its own, and the overlock remained. Surely if there was a problem with the overclock when the PC restarts it would restore the bios defaults?
  11. Try it and see... just save the values to re-overlock it again if nothing changed, maybe he is just fixing the voltage or something like that when he restart.
  12. its not that theres a problem with the overclock as such--mine was perfectly stable at 4.0ghz

    its just that when you overclock it tends to cause the multiple post issue

    wasnt pll overvoltage--thats my new motherboard i was thinking of

    save your current bios settings to a profile--f11 or f12 in the bios

    then set defaults to see if it cures it--you can reload your profile by pressing f11 or f12

    also check you have the latest bios--a bios update may help
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