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I have an issue where my computer/motherboard won't turn on, I am not sure if it is fried but when the ethernet is plugged in the light on the switch turns on, meaning that some kind of current is passing through my machine.

The machine was turning on but while plugged into an extension cord it turned off, and will not turn back on. Possible surge? Possible low rated extension cord? I don't know the gauge of the cord but it has been used for high powered lawn equipment outdoors for many years.

Is there a way to determine if my mobo is fried without switching power supplies? When I turn on and off the PSU, my lights flickr, which they do whenever something somewhat high powered is turned on. How to proceed?

Would the components on the board like the memory and gpu be fried too

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Have you tried unplugging the power supply for a few seconds? I've had this happen after a power outage, several times. The motherboard will refuse to boot until I unplug it for at least 15 seconds or so. –  Bort Mar 30 '13 at 5:19
    
@Bort tried that, nothing different –  cqm Mar 30 '13 at 5:29
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power supply fuse or other fuses blown? Yes there are still things like this around. –  mdpc Mar 30 '13 at 5:59
    
It does sound like a power supply issue but the only way to be certain is to try it with a psu you know works. –  Col Mar 30 '13 at 8:14
    
@Col yeah the motherboard turns on with a different power supply of the same model. Is there anything I can do with the current one? Could the extension cable have fried it or would that have been a surge that fried it. The computer was on for like 5 minutes before just shutting off and not coming back on again –  cqm Mar 30 '13 at 14:32

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