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Computer turn off and on repeatedly

ive had my custom built computer for half a year now,without any problems.
earlier i was gonna put in my old hard drive to my computer,which worked some minutes until the CPU fan stopped working.I replugged the fan and it vent full speed some seconds,which was fast enough that it cut my finger :P
then it stopped completely until i replugged it again and the same happend...
i really didnt know what to do so i turned off my computer,because i was going to change the CPU fan.and i did,when i turned it backon it run for like 10 secs and then it turn itself on,and off repeatedly.Ive made sure all the wires are fully connected and they are.Ive also removed the hard drive which started all this...
and still it only turn off and on...i think its the power box,but do anyone know what it is and how i can fix it? :P REMEBER:im not very experienced with computer's and stuff,so please explain good and dont use those high-tech words :)

SYSTEM SPECS/PARTS:
Intel® Core i3-3220 Processor 3,3GHz
XFX ProSeries Core Edition 550W PSU
MSI B75MA-P45, Socket-1155
Kingston ValueR. DDR3 1333MHz 8GB, CL9
ASUS Radeon HD 7870 2GB GDDR5
Sony Optiarc DVD±RW Writer, AD-5280S
Western Digital® Desktop Blue 500GB
MS COA Label Windows Home Premium 7 64bit
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More about computer turn repeatedly
  1. I had same issue. Some of the componnets is mailfunctioning. In my case was video card dying. This is normal repsonse of motherboard when complete current cycle can't be completed. You can try to discharge your capacitors by pressing and holding power button when unplugged. Remove your hard drive (if not yet) cause it may be draining more power than it should (short cuircut somewhere). If that does not succeed than try removing components one by one until you get normal boot.
  2. if you have a spare PSU i would try swapping it out. when they start to fail intermittent errors, crashes and shut downs can result. could also be a number of other things but i would start there.
  3. ive tryed everything,including removing both hard drives...
    should i start removing parts from the system?
  4. yep you need to start eliminating those potential problems until you actually find it.
  5. i found those little switch which restarted and cleared cmos and bios,and i got my computer on and running worked fine,and then i turned it off to install the CPU fan which wasnt working earlier.When i started the computer again it turned itself on and off....
    I tryed to clear cmos and bios again,but now that wasnt helping ether! D:
  6. Did you got post beeps when computer started normally? Only CPU connected to board?
  7. Eliasu said:
    i found those little switch which restarted and cleared cmos and bios,and i got my computer on and running worked fine,and then i turned it off to install the CPU fan which wasnt working earlier.When i started the computer again it turned itself on and off....
    I tryed to clear cmos and bios again,but now that wasnt helping ether! D:


    that's your hint right there. your cpu fan...it's most likely the motherboards fan connector. try a different fan port on the board like a chas_fan and see if it works then. if not your mobo's fan ports are fried and you need to get a psu adapter to turn one your 4 prong plugs into a fan plug.
  8. i got the beeps when it worked normally.
    ive tryed my old psu and it didnt even have half of the connections :P so the screen card lighs was red and the fan was going but the light on the fans didnt work,and it turned itself on and off like always so im not sure if it is the psu.ive tryed the CPU fan on other port,and it fixed the fan ;)so the fan isnt the problem...but it still turns on and off like always.Ive ordered new cpu and psu now
  9. and even to turn it off,i have to hold down the restart button,which is the button next to the start button and turn on and off the power button which is on the backside of the case...
  10. yeah, only way to do shut it off when that's hapening is to deny power supply to pc.

    Have you tried having CPU + FAN only on board? Nothing else except PSU connected?
    What beeps do you have in that case?
  11. also you could try pulling the motherboard from the case and laying it on static papaer if you have some. plug in the psu and only the fan/ cpu, vid card and ram all outside the case. see if it boots. if it does you motherboard was grounded causing you the issues...if not...were back to the PSU or motherboard being faulty
  12. i might think its the motherboard,because i think the cpu is working,psu and videocard
    the video card has 2 lights which both are green
    when its working it only beep once
  13. Best answer
    okok,now ive tryed the restart bios thing again and i forgot to take it back and my pc is working!!
    it only beep once when i turn it on :))
  14. awesome glad you fixed it!
  15. Nice :)
  16. to bad we can't pick you as the solution to your own problem. you did good! edit i can and will!
  17. yea!! but now its on is there anyway i can find out whats the problem now so i can fix it to make sure it doesnt happen again? :)
  18. did the same problem start re-accuring or did we both misread you and it wasn't fixed to begin with?
  19. never mind its working fine xD sorry :P
  20. so glad it was a false alarm...if you need any more help though i am at your disposal! good job on your own fix.
  21. now it works again...Ill guess ill just have to buy a new motherboard :P
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