When I view HD programming, I get what appears to be a scan line running horizontally through the picture. It scrolls from bottom to top about every 20 - 30 seconds. Its thin and just looks like a ripple.
This doesn't happen in non-HD programming though.
My setup is like this:
I have a Comcast/Motorola DCT3412 Dual Tuner DVR / HDTV Capable box connected to my Dell 2407WFP via component cables.
The monitor has a resolution of 1920x1200.
On the cable box, TV Type is set to 16:9, YPbPr Output: 1080I, 4:3 override 480i.
The monitor was replaced on RMA a while back and this happened on both displays. The component cables are well shielded, if not a bit too long for their application. The display is on top of the cable box; connections are less than a foot apart, but the shortest cables the store had were 6 foot. They aren't coiled up or anything. just sagging behind the desk.
Any thoughts would be appreciated.
I've tried recording the anomaly but I can't seem to capture it on my cell phone.