Power not comming

i've a gigabyte z77 dh3 m/b. some times when i try to turn on the cpu, power not working. that means power not comming via m/b. power supply working correctly. after i reset bios( remove the m/b battery) then power comes. please if you help me i would appreciate it very much
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More about power comming
  1. How do you know that the PSU is working correctly?
  2. How do you know that the PSU is working correctly?[/quotemsg
    becouse when i reset bios, power comes.
    but i'm not sure
    can u plz tell me what should be the main cause of this problem.
  3. Sounds like the PSU.

    when PSU's fail they sometimes go slowly and you get power to the fans and some lights.
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