What happens if you turn off the cable box and turn it on again?
I'm not sure where the snow is coming from, as a digital signal shouldn't produce a snow/static effect. That would indicate to me that a reset or an update to the cable/sat box would likely address the issue.
Keep me posted.
I had the LN52A650 for about 6 months. Every few weeks, while watching cable tv, the picture is lost and replaced by noise (snow). I checked to see that the cable box was still on. I need to turn off the Samsung and turn in back on again. It will show the picture then, without doing anything to the cable box.
Any fix is appreciated.