TV goes black when i change the channel?

On my Toshiba LCD TV quite frequently (at least once a night) the screen will go black when I change the channel (via cable box) or if I change the input. I then have to turn the TV off then back on to get the picture back.

I have the same problem and it is frustrating. I called the cable company who told me to unplug everything from the wall for 1 minute and the plugit back in. "Duh" Unfortunately I had to do this every few hours. I called them back an they performed a reset from their end. It has worked fine ever since.
Mark
"Faith is the ability to see the invisible, believe in the incredible, and achieve the impossible".
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