Here is a list of steps to follow when trying to connect to your soundbar:

1. Unplug Soundbar from HDMI and Power source – Disconnect all cables from the soundbar, including power cable, HDMI cable, and any other input connections.
2. Check soundbar volume level – Adjust the volume of the soundbar so that it is at an appropriate level.
3. Check the power settings of the TV – Ensure that the power settings of the TV have not been changed.
4. Unplug and plug in the external device – Remove the HDMI cable and plug it back into the television and soundbar.
5. Check the sound settings of the TV – Navigate to the sound settings of the TV and verify that the sound settings are correct.
6. Perform a reset on the soundbar, if necessary – If the soundbar still does not recognize the external device, then perform a reset on the soundbar.