I am sorry to bother you but kindly help me on this.
I had brought AMD 4400+ in july 2007. It was working fine till few days back. It suddenly started overheating and shutdown specailly while playing games. I had checked in bios after shutdown, temp is as high as 115 degree celsius for processor. So, i had brought a new processor 6000+. But it is having the same problem. Although temp is around 80 degree, vcore voltgar increased up to 1.87 (max allowed 1.80) and it shutdown again.
My config is AMD 4400 + 6000+
ASus M2N SLI MB with palit Nvidia 8600GT 512 MB
Ram 4 GB
HDD 250 + 500 (both sata)
Power supply 450 W
Make sure your CPU fan is working properly. Could be it's not spinning fast enough or that the MB CPU Fan port is not working properly. Just run it with the side panel open to see if it's spinning the way it's suppose to. Also clean for dust bunnies ^_^