Ok what you wanna do is check if your t.v channel is on HD input. for ex(HDMI 1,HDMI 2)... if the problem continues after using diffrent cables and dvr recivers then for sure t.v is having the problem. Check with samsung for further info.
I have a LN40A750 hooked to a SA 8300HD DVR from Charter. I have been unable to get the HDMI to work with the TV. Charter tech support showed up yesterday and tried three different boxes, but all with the same result. No signal to the tv. We tried all four HDMI inputs. The HDMI cable is a Monster 1000HD-25 foot. I do not have another way to test the cable. Charter is convinced it is the tv. I bought another HDMI cable today to rule out any "cable" issues. Anybody have a similar problem or can offer any suggestions? Oh, component inputs work but I wanted to have only one cable hooked to up to the tv instead of five.