I have an approximately 30 ft HDMI cable going from my tv to my cable box. I cannot get a signal. I tried a different HDMI cable and it worked fine, which leads me to believe that it is the 30 ft cable cable not the cable box. However, I connected the 30 ft HDMI cable to both my Apple TV and blu ray player and I had no signal issue. the audio and visual quality were perfect. Can anyone provide insight on what is going on here? thanks!!!