Got the Samsung 4695 today. I have motorola DVR. I connected HDMI cable from box to TV. Picture Grainy with vertical pinstripe lines. Tried connecting with blue/green comp. cable. Color was terrible. I actually had a better picture with the basic red yellow and white cables, but it still wasn't as good as it should be. I hooked up DVD player. I have a good pic with that. What am I doing wrong here