Prior to this I removed dust from the fans and heat sink. I damaged some pins on the old processor(p4 2.8GHz 512MB cache) when putting it back in. I replaced it with a p4 3E 3GHz 1MB cache, which should be compatible according to http://www.cpu-upgra...SUS/P4P800.html
There is a possibility that something might be loose as I pulled out the power supply.
Your help is much appreciated.