Thanks for the responses.
I bought this used on Reverb, the guy said it was mint. It PHYSICALLY looks very clean. I just can't get anything from it.
Even in tuner mode, using multiple guitars, nothing appears on the display. I'm guessing SOMETHING would since that seems to be how you tune it, so I am ruling out faulty headphone jack and just gonna assume the input is blown.
Disappointing to say the least I wanted to rock out! I appreciate the quick replies here it's been very helpful-- hopefully I'll be able to contribute myself once I get a working unit!