Customer had the cable company out to replace the cable box a few days ago. Over the weekend, I made a service call to this customer as they were complaining the the TV was in 4:3 mode and there was white interferance lines on the top of the picture.

Knew what that was in a moment and reset the Motorola 6412 box back to 16:9 and 1080i.

Tested the system by shutting everything down...(cablebox stays on always). The box had gone back to 4:3 and 480i.

Cable company came out to replace the box today while I was there and tested again.

TV is a Sony crt rear pro.

I was using a DVI cable with an HDMI adaptor at the cable box end.

When the TV was shut off the cable box would reset.

I swapped out to componant and everythig works fine.

Any idea's what is going on. It is almost as if the cable box was resetting itself if it found no live port on the TV which would be weired.