First, some quick specs on my homebuild:
Rosewill Case (cheap)
Antec 480W PS
Gigabyte p965-S3 Mobo
NVidia 7900GS video card
Seagate 500GB Barracuda HDD
Corsair XMS2 2GB RAM
So, I turned off my PC for the first time in a while last night and when I later tried to turn it on, it began to turn on for 4 secs, then it turned off, then 4 secs later, it turned on again, then 4 secs later, back off. It is turning off so quickly that it is not even reaching the POST. So, I disconnected everything piece by piece until i was only left with the CPU and tried to turn it on and it still was not stable. Also did not hear any Missing RAM beeps as there should have been. So, I checked the PSU on a diff compy and that worked. Also, I then went and put in a diff 965P mobo that I had and it turned on for 4 secs, turned off for 4 secs, and then turned on and stayed on and went all the way into my OS before I decided to shut back down.
Now I'm really confused, b/c if it were my mobo then replacing it should have fixed it. If I had fried my CPU (it is overclocked) then replacing the mobo shouldn't have fixed it (which is sorta didn't). A buddy suggested maybe it is the power switch itself but that seems a bit weird to me. Any help? Please let me know any thoughts at all!!!