I am pretty sure the PSU is causing this, but I wanted verification. My mom's computer is built in a Cooler Master Centurion 5 case, so the sticky power button is a non-culprit. What happens is when she presses the power button the fans and lights turn on, but after 1-2 seconds it shuts off. If you try enough times it will eventually turn on, since the crappiest component in the thing is the PSU (Aspire 500w) I suspect it is that. Is there somthing else that would make it act this way, or should I order a new psu? Since it runs fine when it turns on seems a little wonky to me.
What other things are in it? NEC and Lite-On opticals Western Digital 250 GB sata AMD 3000+ Venice Epox 9NPAJ SLi GeForce 5750 and the Aspire 500w PSU Nothing is being shorted out, I am sure of that. Once it starts up it runs fine.
What happens if you just use a screwdriver on the power switch pins? That'd rule out the power button at least.
do you have another power supply you could test? and also other hardware you could test with the current power supply?
This happened to me earlier this year. I had a bad stick of ram that, when replaced, fixed the problem. I suspected it was the psu, but it wasn't.
Oh yes, it's Kingston HyperX ram, so I have high doubts about it going bad. Besides, if it was that the computer wouldn't even turn on.