USB ports on my iMac not working

I tried to connect a battery from something else through a USB port on my iMac and there was a prompt that "the device was drawing too much power and that the USB port will be shut down". I, being foolish enough,plugged it in the other USB port and the same thing happened and this time the computer automatically shut down. I turned it on and neither of the 2 USB ports (out of the total 4) have been working since then.
I tried shutting the the computer down and restarting after an hour but they're still not working. Does anyone know how to fix this!!!

Sounds like the port overload protection for those ports has tripped.
Reset the SMC >  http://support.apple.com/kb/HT3964
1. Shut down the computer.
2. Unplug the computer's power cord.
3. Press and hold the power button for 5 seconds.
4. Release the power button.
5. Attach the computers power cable.
6. Press the power button to turn on the computer.
Then if that does not reset them, disconnect everything and let the iMac sit disconnected for 10 or 15 minutes.
Dennis

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