liveflatout

Hello everyone. I am new to the forum ( first post) New to electric guitars although I have been playing acoustic for 15 years. I got a schecter c-1 FR on a trade and love the feel size etc. I have a MG15 and when plugged in I have almost no clean sound and low gain sound. I have playing lots of other guitars on this amp and had no issues. I am assuming it has something to do with the EMGs. I had taken it to my local shop, plugged it in and it worked fine. It has a new battery. Just wondering if there is some small dumb thing that I am missing as to why it is so quit on my MG15? Thanks for the help .