SP2, T42, and USB problems?

[Kenn]

I have an Intellimouse Explorer 3.0. Once SP2 was installed, the mouse is only recognized on the bottom USB port of my T42. Plugging into the top port was like plugging it into a hole in the ground - no USB beep, no power to the mouse, no detection. Other USB peripherals (including other MS mice) work fine in either port. I've tried installing Intel chipset INFs, uninstalling mouse/hid drivers, etc., to no avail.

It's not a huge issue, but it irks me that it doesn't work. Does anyone else have this problem or know of a solution?

Thanks!