I'm confused, are you running it native or through parallels?
Native: You're probably missing drivers. OSX drivers for notebook hardware don't exist for obvious reasons, so you're shit out of luck there.
Parallels: Try fiddling with the type of connection it has to the host. If i remember correctly Direct had the most success with me running most flavors of Windows and Linux's.
(Any tips on running OSX through parallels if that's what you're doing? I can't seem to get the bugger working. )