Macbook doesn't shutdown properly after upgrading to Leopard

Ever since upgrading to Leopard, my Macbook does not shutdown properly. If I leave my external monitor or a usb cable attached to a KVM switch plugged in, it absolutely will not shutdown. The screen shuts off and it looks like it has shutdown, but if you listen carefully you can still hear the fan. To restart it, I must hold down the power button for several seconds to really shut it down, and then restart in a normal fashion.

Unplugging both the external monitor and the USB cable usually works, however, sometimes when I pull the plug on the USB cable, I get a dialog box telling me that I must shutdown by holding down the power button for several seconds.
 
sad I’m frustrated
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