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Booting usually fails (works every 20th time or so), as does resuming from stand-by. The fans work but there's no POST beep.

Now I noticed that, if I switch power off and quickly reconnect, my PC will boot or resume happily.

Do you have any explanation for this behaviour?

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Test your power supply and make sure it is outputting the correct voltage. If that checks out, you may have a motherboard issue (such as blown capacitors) that affect the way the system manages power.

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