My sister in law was working on her PC (eMachines) the other day and the computer just turned off. No shut down or anything. She tried turning it back on and nothing happened. I thought it might be the power supply so I put in an extra one that I had and the thing still won't turn on. The mobo light comes on but nothing else. Anyone have any ideas what could be the problem. I know this is pretty gerneric but thought I would turn to the people that have helped me out in the past. Only other thing I could think of would be a CPU fan. But not sure how I test it to see if thats the problem. Thanks in advance.