It sure sounds like the tuner part of the card might have died. The other other suggestion would be to take out the cableCARD to just remove that variable and see if you can open the web interface at 192.168.200.1. A shorted or bad cableCARD could hang it as well, but otherwise it looks like it needs Ceton to solve the problem. (if you’re on the beta program there is a new driver 1.2.0.5 if you haven’t tried it.)
John