I was swapping out sub woofer on my 1050. I unplugged the sub cable at the sub and carelessy dropped it on the floor. The outer edge of the RCA conector contacted the metal base of a floor lamp, there was an ugly pop and an electrical arc. Now I'm not getting any signal to the sub. The 1050 was off, first thing I checked, why would there be an electrical arc when the amp was most definately off? I'm wondering if the amp is damaged. Any thoughts?