What power supply are you using? What specific brand and wattage?
Check the cables, especially the cables that connect the case power switch to the motherboard.
Also, check the switch on the back of the actual power supply to make sure it's not turned off; it's easy to hit when moving the PC sometimes.
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"A Darwinian attacks his theory, seeking to find flaws. An ID believer defends his theory, seeking to conceal flaws." -Roger Ebert
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