Got lucky with that one Lee, I'm glad the issue is resolved. Didn't see this thread until now. A friend of mine had a HP that he never cleaned, he fried the video card just from normal windows desktop use due to cat hair, so I gave him another video card. 12 months after that he went to turn it on one day and it would spin up the fans for 5 seconds then shut down. I tried everything from changing the memory modules/peripheral cards and even the power supply until finally declaring the motherboard was dead. Not a bad run for 6 years of abuse due to lack of maintenance. So I built him another dual core computer out of my spare parts, put a nice dual fan 550 watt power supply in for him and hasn't missed a beat since. That PC is everything to him due to his love of music and playing in a band, it had to be fixed, no option.
I did have another friend's pc that would not turn on, I solved the problem by pulling the mains plug out of it for a few minutes then powering up again. Seems the atx power supplies/motherboards can get a bit of a power up bug when left on for long periods of time without a complete cold power down.
