Originally Posted by bcvp
I think only HDMI2 is for DVI. It could be the STB. When it happens try hitting info, guide, menu or something and see if you get an image? You could also unplug the box for a minute, but you'll lose the guide info. I had STB issues and my friend did too. We'd get different problems but sometimes the screen would be black but the other STB options would work. I don't think its a copy protection issue. How long has it been a problem?
Originally Posted by schaffer970
Have you completely unplugged the 6412 from the wall (this does something of a reset) and brought it back up again? The experts on the 6412 are in this thread: Official Comcast 6412 / iGuide Discussion . Good luck.
I've not hooked up HDMI till now. Just had the set calibrated by Eliab. BTW: What a difference. I thought the picture was good before. It's way better now.
Wanted to try HDMI to see if I good get an even better picture.
I've tried unplugging the unit, had the cable co reset the box, tried to get it to come up in the 6412 service menu, no joy. Two seconds worth of picture then black.
I believe it is indeed a copy protection issue, just wondering if anyone else has seen that problem. As I understand it, in order to use HDMI, part of the protocol is to do a copy protection handshake (same is true for the firewire outputs). If the receiving device does not perform it's half of the handshake, the output device will shut down the HDMI port.
I believe this message which I sometimes see on start up is being generated by the cable box, not the TV:
"The HD content protection of your display has been compromised. Please use the YPbPr outputs for your HD connection."
I finally got off my lazy rear end and googled around and found this
interesting thread. The 6412 uses DVI. Comcast is now offering the 3412 which has an HDMI output. I'll give that a try before I give up. Hope this helps anyone else who runs into this issue. I'll post back with the results from the 3412.