I just upgraded my tv to an hdtv. I already had a hd/dvd cable box connected to my tube tv so just needed to change the tv out. When I went to connect the hdmi cable from the box to the tv, it sparked (big) and melted the tv connector and that end of the cable. What could have caused this? When it happened, I remembered something similar happened a while back when I tried to replace the cable leading from the internet outlet at the wall - it also sparked, but not nearly as bad. Any insight?