If the television isn't detecting a signal, try testing the device on a different TV or changing out the cables.
In some cases, the devices may have a setting in the box to send the signal through analog (component, composite) outputs rather than digital (HDMI) inputs. Check that your devices are sending the signal through the connection you're using.
I connect a dvd and a satelite receiver with the tv and there is a sign in the sreen " no signal check connected device's Power, cable connection, and source selection". I check everything and there is nothing wrong.
What can i do to work