Even with nothing connected to my Mac Pro, I get a USB error message

Even with nothing connected, I get this error message:
Because a USB device was drawing too much power from your computer, one or more of your USB devices have been disabled.
I have restarted a few times and restarted in safe mode, and reset the PRAM and it is still there.
Any ideas?

Even with the mouse and keyboard unplugged, I got the same error message. It always gives me 5 warning messages in 5 separate dialog boxes. The 2 USB ports on the front of the machine are disabled, and the 3 in the back are ok.
Profiler recognizes the "Hub in Apple Pro Keyboard" that lists the keyboard and the USB laser mouse (Logitec).
I'll give the SMC reset a try, but I have read in another thread where it didn't work for the guy with the problem, and his final solution was a complete re-install of the system software. I'm thinking maybe an upgrade to Lion 10.7 might fix it without having to rebuild my whole computer. I'm using 10.6.8.
-I'm still perplexed.

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