Please help! I just built a pc but not working!!!

Hi guys, I just finished building and turned it on.
Case light/cpu fan, probably gpu fan, and case fan were all working for 2 sec but then it all got turned off after 2 sec.
currently, power, reset, and CLR CMOS of motherboard has lights on, proving that power current is still going thru the motherboard.
what do u guys think went wrong? please help!!
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  1. It probably is the mobo power, that 8 pin is a pesky little thing. And please don't flame me if it isn't the mobo connector i only say that because that is the most common mistake.
  2. Thank you everyone for answering my question.
    Currently, I fixed the problem but couldn't find the cause of shutting off in 1 sec.

    What I did after failing it twice, I disconnected ram, GPU from motherboard, motherboard from case and started to connect one by one while turning it on each time and it fixed somehow. I know it's kinda wierd, power connector wasn't problem and i am sure I connected everything correctly even for the 1st time, so...case solved yet still mystery.
  3. Ahh this is no mystery this is the power of the computer god, to all you non-believers here is forum proof ^ :D
    Glad you solved it.
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