Constant error message: USB drawing too much power - no USB plugged in for weeks?

Starting about two days ago, I've been getting error messages about every 30 seconds saying that a usb device is drawing too much power, and my usb device has been disabled. I haven't had anything plugged into the usb ports for about 3 weeks, well before I started getting this error message. At first the error messages came up one at a time, but now about 5 of them pop up every 30 seconds..
There seems to be no visible damage to either of the usb ports, and I've updated software and restarted it too. Can anyone help me figure out what's going on?

If SMC and PRAM resets do not correct the problem, make an appointment at an Apple store genius bar for a FREE evaluation.
http://support.apple.com/kb/HT3964
http://support.apple.com/kb/ht1379
Ciao.

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