elec dvr message

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Joined Apr 19, 2014
I get a banner on my tv/monitor saying not supported. I have a 4ch hooked up to it, it works fine. I hook up the 8 ch from same company, I get. "Not supported" reguardless if I use hdmi or vga conn.. Now, when I hook up my 8 ch to a different tv, it works. Can someone tell me or suggest something to try. The tv/monitor I want to use is a orion sled1640 mod hdtv.
Any info, would be greatly appreciated