TV says no signal when everything is correctly connected

Thing is though, everything worked fine with the monitor before until I connected it to the tv. After that, for some reason it stopped working with the tv (on 1080 but works with 720) and now doesn't even work with the monitor on both 1080 and 720 (says
checking signal then no signal).

Also tried different cables as well with same results.

Also what type of connection on you using to connect you xbox to the tv? I know that if you are using HDMI and the console isn't sending the signal out correctly then it won't let any controller connect to the console.

Then as I mentioned the issue is between the TV and the sound bar, so you will need to check the options you have in this regard with the manufacturer

But if after the first seconds everything works correctly, it must be as i mentioned, certain input lag, as the signal had to go trough the Tv and from the Tv to the sound bar

It should automatically detect and decode the DD5.1 signal. Is there another device you can connect to it to test the receiver itself to confirm that it is working correctly? Also maybe the TV itself is causing the issue. Could you connect the console
to the 5.1 receiver?

an hdmi cable connected to a plasma tv and sometimes it also has the xbox on and i can hear it but not show the xbox screen on the tv it says no signal and the hdmi is connected snuggly