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computer will not start

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HI I need help with a computer that was given to me its a new dell dont know what year but I know its a pentium 4 so its fairly new but anyways with the tower open you can see a light on the motherboard is on so its gettin power but when you press the button to turn it on it doesn't do anything at all. But my uncle who gave this to me says my cousins were playing games on it less than a month ago. If you have any ideas what it could be let me know. thanks.
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You could start by making sure all the connections are tight. Moving it around may have caused something to loosen up. Dell has an excellent website that helps you fix your own computer, so go to th Dell site and look up your model.
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it could still be power supply, since each power supply provides three kinds of voltages.....12volt, 5volt, and 3.3 volt.

A PC power supply that looses one of these rails may seem to be working , but still not.

So, I would swap out the power supply first given your basic description. You can plug another PSU into the mainboard without actually installing it....just take your PC and plug it in, while being careful not to touch the power supply to the side of the case

Next up woudl be the motherboard has gone bad.

It could also be a burned out cpu, but often times fans will still spin with a bad cpu.
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