IMac (FP) won't shut down

The shut down sequence gets as far as the grey screen and then hangs. I thought it might be SuperDuper attempting to back up or something on the external drive. However, the problem persists with the first turned off and the second disconnected.
Anyone help?
David

Hi David,
If you've recently connected a USB device it may be the culprit. If not, hold the power button for 5 seconds to force a shut down then reset the PRAM by holding the command-option-p-r keys as you start. Release them after you hear the chimes three times. If that doesn't correct it reset the PMU.
http://docs.info.apple.com/article.html?artnum=95165
John

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