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Msi p67a core i5 - wont post - keeps rebooting

Last response: in Systems
November 25, 2011 10:59:58 AM

I have rebuilt my system with a new motherboard, cpu and ram. once ready it was running fine all day, the next day while in a game it crashed. Since then everytime I power on it wont post, it only stays on for a few seconds then turns off. the strangest thing though is that it then powers itself back on without touching it. and this continues until I turn it off @ the PSU or unplug it. Does anyone have a solution to this, looking round different forums I see others have had similar issues which have been solved by taking apart and putting together again. This has not been the case for me. Just to let you all know that when it does power on all the fans and led's are on and I have tried powering on without, RAM, GPU, fans etc, nothing works. Please help. My Specs:

MB - MSI P67a
CPU - core i5 2500k
GPU - nvidia 4700GTX
PSU - corsair 750tx
a b B Homebuilt system
November 25, 2011 11:38:46 AM

Did you reuse the hard drive? Did you do a fresh install of windows? You need a fresh windows install with that new motherboard.