Secondly, it could be an issue with the display or other HDMI device. Make sure that the HDMI cable is securely connected to both the HDMI device and your Mac. Firstly, it could be an issue with the cable itself. If your Mac is not detecting HDMI, it cold be due to a number of reasons. Troubleshooting Mac HDMI Connection Issues After that, turn off both your TV and the connected device, then turn them back on again to let your TV recognize the connected device. Then reconnect it firmly to the same terminals as before on your TV and connected device. To fix this, first disconnect the HDMI cable from the HDMI Output terminal on your connected device. It’s possible that the HDMI port is not displaying because the HDMI cable is either not connected securely to the same terminals on both the TV and the connected device, or it could be that the TV has not recognized the connected device yet.
Finally, check your Mac’s display settings for any changes that might need to be made in order for it to detect displays. If that doesn’t work, check the connection of any other cables you might have connected to your external display and if necessary restart both the Mac and the monitor. If you are using a USB-C or Thunderbolt adapter, make sure it is securely connected. To troubleshoot the problem, start by disconnecting and then reconnecting the cable from your external display to your Mac. It could be that the cable connecting your display to your Mac is faulty or not properly connected, the display itself may be malfunctioning, or there may be an issue with the Mac’s display settings. There are several posible reasons why your Mac is not detecting displays.
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