I've had this pc about 4 years. I used it fine one day, but now (1.5 days later) it will not start up at all. There is no sound, no fan, no lights. There have been no storms, no suges that I am aware of. I tried unplugging the power cord for over 5 minutes and holding the start button in for ~30 seconds with no luck. I am inclined to think it is the power supply. Suggestions?

Thanks!

Look at the back of the power supply and try to find the power switch (a rocker switch that has a vertical bar for on and a circle for off). If the switch is off, turn it on and try to boot the machine. If the switch is on, turn it off for about a minute, turn it back on, and then try to boot the machine.

If this doesn't fix the problem, it's possible that your power supply is shot. There are a number of other possibilities, but without being there, it's very hard to diagnose the problem.