It's very rare for CPU's to go bad. In the 15 years I've been a computer tech I've only run across one bad CPU. Chances are you have a bad motherboard. Tried removing any PCI boards and memory chips one at a time to see if you can get it to boot. Also reseat any connectors.
Here is what I would try 1. go to your motherboards site and find out how to reset the bios to its original state..(probably remove cmos battery and set a jumper and then reset jumper to run and replace cmos battery..also check cmos battery charge with multimeter..2.Reflash updated bios...check power supply voltage with a multimeter...3. if you have 15 bucks and can wait a week or so for ebay buy a PCI Post Diagnostic Card to put in your dead (or not dead) computer to check the motherboard, cpu , capacitors ect..4. If you have made an emergancy boot floppy to boot your computer then try that..5.. Did a short develop in a power surge protector..check input power..6..Is every thing plugged in on the motherboard..7.Buy some cpu thermal paste and remove your cpu heat sink and look at the top of the cpu to see if it is burnt..repaste and reinstall if not burnt.(can reach 500 to 600 degreess with a fan not working..do not apply very much leverage to remove the heat sink (how good was your heat sink and fan) fragile if it wont come off easy leave it alone)..8. Is your power supply adequate for your system..a new cpu with a couple of sli cards and a couple of hard drives and 4 sticks of ram can consume 475 watts of power (at 70% power supply efficency you would need a 650 watt power supply..most systems consume about 285 watts which implies a 400 watt power supply..9.Full format hard drive and reload windows..10. Does hard drive spin up? boot sector corrupted on hard drive..is bios set up to recognize hard drive..ie..sata scsi ata ect..Mwave.com, tigerdirect.com ebay ect have some very cheap boards and board cpu combos..but if thats the case..you may have to repurchase windows as your would now have a different computer..11 try your hard drive in another machine 12, if you can get a dos promp you can try system restore
Last edited by andyj; 12-26-2006 at 04:15 AM.