Audio Systems: receiver/dvr cable box, motorola dvr cable box, pioneer receiver

Question
I have had my pioneer receiver and Motorola dvr cable box hooked up to my sharp TV for over a year with no problems. All of a sudden now when I turn on my system the cable box will flash "du1"  for a few seconds. I called the cable company (Cox) and they tried resetting the box but I still have the same problem.I also cannot get the surround sound system to work in pmc. cable company states du1 is actually "dvi".
I have the cable box going to the receiver then from receiver to TV using hdmi cables. Any idea what the problem is?

Answer
Try resetting the cable box and the receiver.  You can follow the manual instructions on how to reset manually or just unplug the power cords for at least 1/2 hour.

Also, try going direct from cable box to tv and see if that changes things.

The DVI is an input format and the box is sensing something different in the settings of either the tv or the receiver.  Have you changed the settings on the tv lately?  Go back and review those settings in the menu and put them back where the were originally if changed.

Hope this helps.