Well, after making sure they're plugged in correctly, I'd try another power supply. It sounds to me like the 5v or 12v power supply rails that give out the molexes simply aren't getting power anymore.
If you can't test it out with another PSU, I'd take it back to Best Buy.
-Lasereth
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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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