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I've taken everything out from the computer there is only the motherboard with the CPU in it. When I switch it on the fans start, but nothing happens. No beeps, no POST.

I guess either the motherboard is faulty or the power supply. I don't have any replacement parts, so I can't replace any of them to test which one is broken.

Is there a simple way which doesn't require additional tools to determine the culprit?

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I would love to hear differently, but I believe at this point you need parts to swap in to test now. The only advice I can give is that a new PSU is likely to be the easiest and cheapest to swap out.

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Cheap power supply units are a false economy. I'd try to borrow a spare machine. Might be cheaper to take to a repair shop, as they will have spare parts to hand. – Iain Feb 15 '10 at 9:07
I brought it to a shop. The motherboard was faulty. – Tom Feb 15 '10 at 14:06
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