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Computer doesn't work after crash/burning smell

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I was browsing websites on a four year old Dell Dimension 4700 PC when all of a sudden the computer suddenly turned off. The computer would not turn back on and the power light on the front of the computer, which normally is green when the computer is on, blinked yellow over and over again. After unplugging the computer and plugging it back in, the blinking yellow light went away and the computer did power on (complete with green light), but there was a horrible burning smell coming from the machine and nothing loaded. Every time I try to turn on the computer now all I get is that green light and an incredibly loud fan, nothing comes on the screen, I hear no beeps, nothing.

What could this possibly be and what could I do to fix it? Thanks in advance.
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Neil Jones

Neil Jones

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Power supply failure that sounds like it's took out the main board.
This model fortunately doesn't use a Dell unique PSU so if you have a spare power supply somewhere connect that up and see what happens.
Same result on a new power supply? I'd argue the board's dead then.
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