Bajablo on 05 March 2017
if that doesn't work. try and send out a different signals from the computer. edit: not just 4k, try 1080 etc. etc.
and see if you have some pre-defined settings on the HDMI port on the TV, sometimes the handshake thing goes to hell and the TV gets bricked from signal inputs, or they have conflicting settings and nothing shows bc. of that
