Infocus 5700 HDMI issues

[mramplifier40]

I have a Infocus 5700 projector. The issue I am having is confusing. First, when I hook it up to my Comcast cable box, the defalt screen size setting menu screen will come up for a second an the screen will go black. I was told by Comcast that it is the projector. Second issue. The projector will play home recorded DVD videos just fine. When I try to play a movie. the screen will go blue. Once in a great while, I can get the movie to work through the HDMI input. Samsung has informed me that it might be a copyguard issue an also informed me that it is the projector at fault. I have changed cables an the DVI adapter Have contacted infocus on this matter an was told it was that it might be the HDMI cable or the DVD or cable box at fault. Any advice would be great

[minnie]

Try hooking it up component? Motorola cable box?