Luke III no sound coming out

Hi guys, I just got a used Luke III, and no sound comes out, seller said everything was working fine before he shipped, and has agreed to take it back for full refund, but I really like the look and feel of this one. Any idea what it might be??
So I plug it in and it sounds like the volume is in 1, with the boost on. Boost off and no sound at all.. on either pickup.. changed to a new battery as well..
Any help will be appreciated.

Jorge