I searched multiple forums and could not find something similar enough to what I am experiencing with this computer, so here I post my scenario and question. My girlfriends computer (Emachines T2742) was just running fine the other day. Her dad said it was turning off by itself all of the sudden and now it won't even come on. I took it completely apart "everything out" and cleaned out every spec of dust. Hooked up a known working power supply (it has a test button on it). Only having the power supply connected to the mobo and the hard drive with all other components disconnected, the test button is pressed and the ps fan and cpu fan turn on. There is also a green light on on the mobo "which means the mobo is getting power" correct? I press the power button on the case and nothing happens. I hooked the power led, hdd led and power switch all to a bread board for testing and they all work fine when the power button is pressed, so I know it isn't the switch which is bad. I tried everything I could possibly think of and the damn thing will not turn on. Also, I tried to turn it on with ram properly seated. Can someone give me some ideas please, this is driving me nuts. I almost am starting to think the power supply went and took the mobo with it. Possible?