Why is my Mac not detecting HDMI?
If your display isn’t recognized If your Mac doesn’t recognize your HDTV, display, or other HDMI device after making the connection: Turn off the HDMI device while your Mac is turned on. Unplug the HDMI cable from your Mac, then plug it in again. Turn on the HDMI device. Why is there no HDMI signal from my device? Reconnect HDMI …