I just received my STF-2 and was so excited to hook it up, I used the high level inputs. I haven't received my HK 225 yet, so I used the speaker wires from my Kenwood shelf system. When I turned it on, no LED or noise. I looked in the manual and it said the power cord is hooked up incorrectly or the fuse is blown. I checked the fuse and it is fine, and I tried multiple outlets. What did I do wrong?