IP35 Pro booting issue

[Evilution]

So I've scoured the internet for numerous hours trying to find the exact same problem I have with no luck. Many variations but not that one I'm having. The other day I was tooling around on my PC I don't remember what I was doing but it just powered down. At first I got a C3 post code. I checked for loose connections, took out all the RAM and tried it stick by stick. Tried clearing the CMOS. What has me baffled is sometimes I try and power it on less than a second and it powers back down. Sometimes it will power itself back on but rarely. Sometimes I power it on and it goes to Post code 90. Sometimes it will boot all the way to windows. When it boots to windows it usually doesn't turn off until I play a video or a game. I'm assuming either the MB, bios, or PSU is dying. I'm thinking I can rule out the bios since it boots all the way to windows "sometimes". Or maybe not. Help!

[jasonlok]

have you ever check the motherboard chipset and pwm temperature when u boot into bios?

[Evilution]

I have checked all temps with speedfan. CPU is running at 10 celcius. etc. The only thing running hot is my 8800GT at 59-60 celcius. But I've heard those run hot as it is. It is not a temperature issue.

[jasonlok]

what is the power supply you using now..? or you can list out the whole spec of your system.

[Evilution]

Yup I will give the whole specs of my system.
Core 2 Duo E6850
2 Western Digital 300gb SATA hdd's.
Soundblaster X-Fi Xtremegamer PCI audio card
4 gigs of Corsair XMS2 DDR2800 4-4-4-12 2.1v ram 4 1 gig sticks.
IP35 Pro MB
Power supply is a OCZ 850 watt
BFG Nvidia 8800GT 512 meg on PCI Express

The system has worked flawless for the last couple years.

[jasonlok]

have you try to boot your pc with another power supply..? or just try boot up with mobo, processor, gc, and 1 stick of ram. check what post code it will give...

[Lvcoyote]

You either have a bad BIOS, bad PSU, or bad board.

[Evilution]

Thread closed. I'm done messing with this thing. I just hopped on newegg and ordered up new parts to build a new system. Thanks for everyones input, I just don't want to fuss with this thing anymore. Thanks again for everyones input. Cheers.