How do I reset or enable a disabled usb port on a macbook air 10.7.2

Ok, tried installing a thumb drive and a message says "too much power is being drawn, usb is disabled..."  Does anyone know how to reset or enable a disabled usb on a MBA?  Thanks

Reset PRAM & SMC several times with no luck.  Took it to the apple store and did a diagnostic...pass, but USB still does not work.  Genius says, USB hardware will need to be replaced...FREE (under warrantee).  It would have been $280 for labor and parts replacement.  Should be ready in 5-7 days.  Lessons learned, don't buy cheap USB thumb drive.

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