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motherboard and power supply have suddenly become incompatible

I have an assembled desktop which i use for video editing. Here is the configuration:

1) processor : intel i7 - 3930k 3.2 GHz
2) motherboard: Asus P9X79 pro
3) graphics card : Nvidia Gtx 680
4) 32GB ram
5) corsair H100i hydro cooling
6) corsair Tx850 power supply

After a month long vacation during which my desktop was off , when i restarted my system i faced a strange problem. The system would start for 2 seconds, then restart, then turn off then restart and so on. Here is a video of the problem as it stands today : https://www.youtube.com/watch?v=KXQwCMJmby4

My first instinct was that possibly its a power supply issue. I got it replaced but the problem persisted. The same supply is powering other motherboards. The motherboard is booting from a 450W power supply but not from 850, 750 and 650W. So i'm stuck with this sudden incompatibility. HAs anyone faced this problem before? Please help.
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More about motherboard power supply suddenly incompatible
  1. Have you tried remove any possible dust build-up from a month-long non-usage of your PC? Try also re-seating your RAMs and GPU.
  2. raisonjohn said:
    Have you tried remove any possible dust build-up from a month-long non-usage of your PC? Try also re-seating your RAMs and GPU.


    Tried all that. Like i said the motherboard is booting with a smaller power supply
  3. Best answer
    Try first reseating the cmos (motherboard) battery. If that doesn't work, try a replacement.
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