Got a call to a pal's house last week. Old AMD would not fire up (PSU was VERY warm to the touch but no power/led's etc). I substituted my daughters PSU and when I switched the power switch on, I got the CPU fan spinning and front led's lighting up - but nothing else. I disconnected memory, graphics card, modem etc one at a time till everything was off, but still no joy, so I assume that possibly the PSU had thrown a wobbly and caused damage to either the mobo or the CPU (stuck an old P3 board & CPU in her case and her machine was back up and running in no time - didn't even have to reinstall OS on HD, which someone told me I probably would have to do). So, is there any other checks I could have done (without any fancy tools) to verify whether it was the mobo or CPU that was defective?