When I plug my guitar into garageband i have no signal at all or sound output?

Question by sid: When I plug my guitar into garageband i have no signal at all or sound output?
I have a new imac, i plug my 335 into the input with a 1/8 adapter and plug in heaphones for monitoring. I go to system preferences and choose line in. I open garageband and choose g. track and open audio/midi and choose built in input. I go to track info and choose monitor on and line in 1/2 for input. Im getting no sound or response, do i need to download a driver or is something missing. I

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