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I have a dual monitor setup using both of the thunderbolt ports. The third monitor that I want to add that is not being recognized is HDMI and I have it plugged into the built in HDMI port. It's just blank and not being detected by the computer. What do I need to do to get the computer to recognize the third monitor?
you have an old mac. i’m not sure it supports 3 monitors
you have an old mac. i’m not sure it supports 3 monitors
3rd Monitor not being recognized on my MacBook Pro (2015)
