We've got 3 of these boxes connected to Samsung commercial ED-series TVs. They're all coming up as 1440x640/60 resolution with no picture, but occasionally get the HDMI/DVI blocked message with a blue background. Normally there is no picture.

I can hook my laptop up to them over the HDBaseT extenders and it comes up perfectly.

How do you get into settings on this thing, or how do you reset it?? There are no buttons on the box, no LCD on the box, nothing.

WHat size ED?

for a 32", that might be the right res as they are 1366x768 panels

Do those sets support HDCP? they look like they are designed for digital signage and I dont see anything about HDCP on the cut sheet I found.

Your laptop would not necessarily output a HDCP encoded image.

I got the resolution set (it's GUIDE when the box is off, not MENU...) but even with just any info or menu screen up, it constantly drops out and resyncs. Even the Info menus when the box is 'off' do it.

Haven't gotten to the possible HDCP issue yet.....

6 hours wasted... and today I fixed it in 5 minutes by putting an HDMI splitter after each cable box....

Thanks to Zonn at Zektor once again for setting me in the right direction - I had totally forgotten this cable box model was one of the ones that had that issue. Almost every job we do gets Verizon Fios so we rarely even deal with Comcast boxes anymore. Shockingly, almost every time we do, there's a problem!