Quote Originally Posted by FoSHO99 View Post
I would doublecheck the power on switch, but I'm guessing you have a bad power supply.

I'd go through these steps to doublecheck, make sure your not missing any beeps or light flashes for that unit that may tell you something more.
Computer Does Not Start (Windows Vista) HP Pavilion Slimline s3600z CTO Desktop PC | HP® Support
So I have the power supply out, had to take the entire innards of the computer out because it's such a small compact case, lol.

Now that I have this out, is there any way to test this without a voltmeter or something? Like a way to turn it on? I see now that power switch goes to the motherboard first, then the motherboard tells the power supply to turn on, so it could be a motherboard causing the issue even though the power supply is getting power.. it's not getting the signal to turn on maybe if the mb is bad...