That is an indication that the video decoder on your projector is worse than the one on your apple.
Find out when test patterns are broadcast on your HD channels and try to make the basic video adjustments. And of course first of all make sure the red cable is connected to the red port, blue cable connected to blue ports, and green cable connected to green ports. The complexity of three cables for a video connection is beyond the brain capacity of most cable installers!
You could try a digital interconnect with your cable box - but there is no guarantee that your cable box is any better than your projector at video decoding.
Find out when test patterns are broadcast on your HD channels and try to make the basic video adjustments. And of course first of all make sure the red cable is connected to the red port, blue cable connected to blue ports, and green cable connected to green ports. The complexity of three cables for a video connection is beyond the brain capacity of most cable installers!
You could try a digital interconnect with your cable box - but there is no guarantee that your cable box is any better than your projector at video decoding.