Error message popping up over and over for no reason

I keep getting an error message that says my USB has been disabled because it was drawing too much power. This happened the first time when nothing was in the USB port and it happens over and over even when my computer is plugged in and not using and USB ports. Sometimes when I turn my computer on there are 3-4 messages all saying that same thing on the screen. I tried restarted and turning off for a while and turning back on but it's still doing it over a week later! Help!

Try Resetting the System Management Controller (SMC)
Follow the Steps here
http://support.apple.com/kb/HT3964

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