Us-122 Help (inputs Won't Light Up...are They Dead?) Options

[sti robot]

I just got an open box (I know, I know) us-122 at the local guitar center and it came with absolutely nothing except the unit itself. I have installed the drivers on the mac and everything successfully. The problem seems to be coming from the line in inputs. I have tried both my guitars and various different cables (thinking the cables where messed up) and yet I get no signal to the unit (I have no midi devices and no mic cables to test with). The lights almost never light up. Once in a while I can get some input (reflected on both the us-122 and the computer) when switching between line and guitar, but that is only for a millisecond.

Do you think it is broken? Should I take it back (they had two of them in the same condition...no manual/cd/cable/etc)? I may be screwed because of their return policy.

I have half a mind to pop open the us-122 and check the internal connections.

nice forums btw...and thanks for the help