Hey guys I have an MTX 6500d that I sold to my friend and it is back in my possession and it has a problem, everything on the amp seems to work except for that there is no output coming from the terminals.

When the amp was still in my friends car it would cut out sometimes until recently it has not worked at all. I also notices that he had the bass boost all the up(i told him not to turn up). Ill probably bring it to S & S to get the amp checked but before doing that I just like to know if anyone knows what could be the problem.