PC Will Not Boot!!

Was the machine overheating or crashing before this happened.
Start by removing all cards except the video card
Make sure that you have all connections seated properly.
Have you checked the cpu and the cables to see if they are bad.
This one is difficult in that you have ruled out everything but the motherboard,which maybe your culprit.
You may want to try the hard drive in another machine and see if it is operating properly.

This is a problem I had one time with a computer I built for a friend of mine except it would cut off at random times. This may or may not be your problem but definately worth looking into. Check your Power switch. If its the type im talking about its a momentary pushbutton. The contacts in the one I had had fallen out of place and the least little bit of vibration would cut it off. Maybe this could help.

If this is not the problem think about the vibration aspect of it. Maybe a bad solder joint on a board. Maybe the vibration of the fan, or maybe a solder joint getting hot. IT only takes a few seconds for a point on a pc board to warm up.

Good Luck,
let me know what you find.
Electronics Junkie =)

try pulling the modem. the modem is the most likely entry point into your computer for lightning current surge. Also, if lightning did enter via the modem, it is possible that other devices integarted into the MB on this system also were victimized by this current surge.

This system may be an insurance write off.

Good luck.

I have seen a couple of problems very similar to this one. In one case, it turned out to be an LED indicator light incorrectly connected to the reset contacts.
In a second case (which sounds more like your problem), the problem was the power switch on the front panel. When you clicked it, its contacts stayed closed for a few extra seconds, instead of opening immediately. The motherboard sensed that the power switch was being held for 4 seconds, and of course, this was its signal to shutthe system down. In this case, I replaced the switch and the problem was eliminated. Hope one of these helps you.