odd problem- systems stalls if keyboard is plugged in on boot

I recently built a system for my roomate- pretty sweet setup in fact.

Only one problem- The systems hangs on bootup if his keyboard is plugged in (works with mine). NOT the os, the mobo wont finish posting. Works fine if the keyboard is plugged back in after boot up.

Oddly enough, they are both logitech wireless keyboards, although his is the newer version-I think its the x300 or something like that.

Mobo is a difi lanparty nforce4 ultra. I havent had much time to look into it yet- but Im wondering where to start. Coul I perhaps turn off the bootup keyboard seek?

maybe, have tried a different bios?

There should be two options in the bios you could mess with.
1. Halt on error selection - Set to "All, But Keyboard" manual page 80
2. Check manual page 94, enable usb keyboard bit.