[garrett2794]

Hello!! i have a dell dimension 3100 ad have used it for the past few years. worked great until a couple of days ago. left home for the weekend, came back ad it wouldn't turn on. i dont have the cash to get it fix and it cost a good amount just to get a diagnostics done. when you plug it in ad press the power button, othing happens. i took the side paneling off and there was one light on towards the bottom by this round metallic object. not much on computer stuff....so could you help me out?

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Check for bad caps first:
http://www.badcaps.net/pages.php?vid=5

If they look ok, try a different power supply next.

[SpywareDr]

Check for bad caps first:
http://www.badcaps.net/pages.php?vid=5

If they look ok, try a different power supply next.

[123Runner]

Troubleshooting computers is a lot of trial and error. The light on just indicates 5vdc on the board. A momentary contact from the power on switch sends a signal through the board to tell the PSU to turn on.
The 1st place to start is with another PSU (as indicated). I highly doubt that the switch is bad.