Unable to view HDMI content

[wireless]

Hello,
I have tried connecting two different TV's (Insignia & LG brands) to my Optik box. I find workable (I think) codes for both of them, at least they load. The TV screens display the Optik info (Guide, etc.) but there is no TV picture. On the Guide page it says in the upper left hand corner "Unable to view HDMI content"; the same message for both TVs. Does anyone know what the problem could be? If its relevant, I have a Slimline (not 2) remote. Calling Telus Support just got me 23 minutes of pop musics and then a hang-up.
Thank you


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