I'm working on a 10-yr old HP pavillion pc. The pc would not turn on at all, monitor displays 'no signal'. the pc lights flicker. I had an older atx power supply and tried that- it worked. so I know that the old power supply was bad. the case was VERY dirty. almost all the vent holes were clogged. even after I tried my 'new' power supply, the cpu fan does not come on and I still get 'no signal' on monitor (the hard drive/cdrom drive DO come on). I'm thinking the power supply blew, taking the mobo with it. I don't want to spend alot of time on this, but can anyone offer any thoughts on this? thanks.