I just wanted to thank 67firebird455 and others for the fix on the DVD screen. Mine went out for a second time recently (first time it was still under original warranty) so I took it to a local dealer. They charged $50 diagnostic fee to tell me the screen was bad and I would need a whole new assembly which would cost $620+ tax. I found this thread, tried reversing the cable at first with no luck, so I bought a new 40 pin ribbon. Unfortunately, the 20 pack was on back order, so I ordered 1 from another seller on amazon for $20 (I know it was a mark up, but I was anxious to get it done and its still a lot less than $620. It worked and my middle row DVD player is now functional. Thank you to everyone for the posts. Also, want to reiterate the disappointment in GM as I have had a multitude of other issues with my Yukon Denali XL including a bent pushrod last year that put me in a loner for 2 months as one of the parts was on backorder. Too many issues for a $73000 vehicle.