If your HDMI port is not working, there are a few things you can try to reset it. First, unplug the HDMI cable from the port and plug it back in. If that doesn't work, try a different HDMI cable. If that still doesn't work, you can try resetting the TV itself. To do this, unplug the TV from the power outlet and wait for 30 seconds before plugging it back in. Once the TV is back on, try again to connect the HDMI cable. If none of these steps work, then you may need to replace the HDMI port on your TV.