[CPU] Won't Turn On

Please post your specs. Do you all power cables connected?

did u plug in the cpu 4 pin,

take the basic components out and test it on a non conductive surface

You said this started BEFORE you installed the new mobo right? I'd say your two prime suspects are your cpu and gpu. I'd go out and buy a cheap gxf card and test it with that; you can always return it later.

With a bad cpu it would turn on briefly and then shut off to prevent further damage to the system. It would also do this with a burned gpu or improperly seated/defective ram.

I just noticed your CPU. Being as it's way underpowered (800mhz bus speed, 2mb cache), if you were trying to play a newer game with it then it would pretty quickly breach it's 73.3°C threshold. Unfortunately those old conroes weren't very good at shutting down in time.

I think you're right. Probably time for a new processor.

If you take your gpu completely out and use your integrated video and it's still doing it, then yeah it's likely your cpu. Although I wouldn't say definitely. I have nearly the same cpu in one of my desks. It burned out a long time ago but curiously will still start the computer. However it idles at 50°C and with a load it climbs to over 90°C. This is enough to cause permanent damage to other components and even the mobo itself.

Problem solved.

It was my graphics card. I have the nVidia Geofrce 8600GS PCI-e card. I believe it may be dead because when it's in, my comp doesn't turn on. When I take it out, my comp finally turned on. Guess I'll be throwing it in the garbage and looking for a new one.

Thanks guys.