USB shut down - too much power drawn

Hi
Yesterday when trying to connect my Canon EOS350D to my MBP, I changed the camera settings.
Then, a message appeared on the MBP saying something like "A device is drawing too much power from the USB port - shutting down the bus".
I figured it was temporary. Seems it's permanent. Many reboots and resets (PMU) later, no USB device that I own will work in any port in any way.
Any ideas? I am fairly tech literate but this is my first Mac. All up to date.
Thanks
Dom

OK - It seems to have been fixed.
I called Apple, and they did a PRAM reset. When we restarted, still no joy, so we did a full hardware scan.
This came up clean. They passed me on to a product specialist, but I had to go to work.
Then, tonight, it works. Powered USB, data, all as new.
So, I guess if this happens to you, do a PRAM reset and reboot a couple of times.
Cheers
Dom

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• If USB Overcurrent problems arise using a bus-powered, third-party USB hub, try a self-powered hub or connect the USB device directly to one of the built-in USB ports on the computer itself.
• If USB Overcurrent Protection issues arise when a device is connected directly to one of the built-in USB ports on the computer itself, then the peripheral device or its cable is either damaged or defective.
Note that you can not put two bus-powered hubs in series. In addition to the article "USB: Hub Description", see also "Apple Pro Keyboard: Devices Connected to Hub May Not Work."
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