I'm sorry to hear that you're having this problem.
Try changing the video output resolution in the cable box with a TV that works. Often times, a No Signal issue can occur when the resolution isn't one that the television recognizes.
Another issue is that the HDCP chip in the cable box may be bad, which might explain why it might work on one TV and not another. If the cable box continues to give you an issue, you might want to have a service tech from the cable company come out and check your lines. If it still doesn't work, then the television may need to be inspected, and that can be done by calling 800-SAMSUNG.
Keep me posted.
My Samsung HDTV displays "No signal" for the cable box. If I unplug the HDMI cable, it says "Check signal cable." This makes me think that the tv recognizes the cable box.
Comcast says it is a problem with the TV. Samsung says it is a problem with the cable box. If I hook the cable box up to another tv (which is a pain) it works.
The cable box worked great for months then it quit working (it was less than 6 months old). I replaced the box at Comcast and it didn't change. I replaced the cheap, Comcast HDMI cable with the one I used for the BluRay and it worked but the cheap HDMI cable didn't work on the BluRay. So I bought another HDMI cable (same model) for the cable box. It doesn't work on the cable box. The BluRay works on all of the HDMI inputs on the tv - so there is no problem with the inputs.
Scientific Atlanta cable box: 4250HDC.
RocketFish cables: RF-G1160