Unplug the power cord from the power supply (or the wall outlet). Wait 2-5 minutes. Plug it back in and push the power button. This works for me anytime my computer fails to power on which is usually when my cat walks on the on/off switch on the power strip. I don't know what it is, but I have to unplug the power supply and plug it back in to get it to boot up after that.
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