PC not starting up

[TwistedJester]

Apparently something in my old computer, which I gave to my family to use when I got my new one, is fried/broken. I'm assuming the power supply is dead (as it was some cheap, generic brand), but I'm not sure if that's really the case. Right now, when it's plugged in, the mobos onboard LED is lit up, as is the ethernet ports LED, but when I hit the power button, nothing at all happens.

I have no idea what happened to it, my family just leaves it on all day. Apparently it was running, and then when my sister went to use it, she claimed the power light was still on, but the computer itself wasn't. She tried restarting it but it wouldn't. Any ideas what might have died or any ways I could check to see what is salvagable?

 

[nowshining]

try checking to see if any of the connections are unplugged inside the computer itself..and if it has a switch for changing the voltage, make sure that is set for ur area..