Intel Mini powers USB device after shut down

Last night I shut down all of my equipment and later returned to find that my Intel Mini (Core 2 Duo) was powering my Microsoft keyboard that was connected directly into the Mini. This happened once before with a USB-powered hub but I thought the problem was with Leopard. However, last night I shut down from Tiger so the problem is apparently with the Mini. The Mini shut down fine but then mysteriously repowered itself and the keyboard.
The only device connected to the Mini's USB ports now is a 7-port self-powered Belkin hub but that stays off once it's powered down. The problem only seems to be with bus-powered devices. I now have three empty USB ports on my Mini that I'm afraid to use with any bus-powered devices. Has anyone else experienced this with an Intel Mini? I have the latest Core 2 Duo model, 1.83 GHz, 2 GB RAM. Any advice, comments, etc. will be appreciated. Thanks.
Claire

Last night my Mini started up by itself again so today I checked the Console System log and discovered that a program I'm using for backups (Data Backup) was scheduled to run every half hour and, apparently, it tried to do that while the Mini was shut down. I guess it was successful a couple of times. I've disabled the scheduling feature of the program and I'll wait and see if that solves the problem.

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