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Lately, my desktop PC does not turn on the moment I press the power button. It takes a while (10 mins to half hour) to turn on. I can see the LED on the motherboard is on all the while, but it doesnt respond to anything else I have tried.

Any ideas what the problem could be?

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Your power supply probably needs to be replaced. It's likely having trouble getting the power levels up to what they need to be to actually get the machine started until after enough time has passed.

If this is the case, then continued use in this manner may even damage your motherboard (which is normally more expensive than a new power supply) or other components in your computer (such as the hard drive).

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