Good point- it's just an "apple mouse," not a pro one.
Well, here's the thing. I have two PMG4s and am currently playing with the 350Mhz Yikes! one. The mouse is now working, it just takes a while to kick in. However, the newer, Gigabit ethernet 400Mhz Sawtooth doesn't accept it, on any USB socket, no matter how long I wait?