Guitar hero III not recognizing controller

ok so i just finished installing guitar hero III on my new mbp, and it runs beautifully, except for one minor flaw, it refuses to recognize my guitar. The light on the guitar is on, but the game won't budge, except with the keyboard which is no fun. I tried updating the game, restarting the mbp, no luck. Anyone have suggestions on how to fix this travesty.

P.S. i put in a "ticket" to aspyr but i'm not hoping on as helpful results as from you guys.

i did, i deleted it, is there anything else i have to do?

i think i only erased the preference file, where are they located?

EDIT: yes i only deleted the pref file, so it is still not working! agh, so annoying!

connections are fine. I had been clicking through the intro with the keyboard, but i tried to do it with the guitar and it didn't work at all! so it's still not recognizing