What did you choose for input and output in garageband preferences?
Did you choose the correct input channel (mono 1 or mono 2)?
Is monitoring turned on?
Do you have the playback volume turned up on the speaker/interface?
So I tried a multitude of things before i just gave up... took it to a friend's house today and it didnt work there either...
i ended up taking it back and getting a blue bird, shouldve just done that from jump.
Thanks for your help though. I just didnt really have time to wait, i had to get a project done for a friend.