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Are you using an HDMI to HDMI cable? Try using a display port to mini display port cable. That should work.
Sorry, there was a problem. Please try again later.I guess you have distinguished HDMI 1 and HDMI2 ? I guess you have been using the three buttons on the back at the right-hand side above the power switch? I takes a little while to nut out how they work. Simple start: press the top button, then press it again. Then press the bottom button to move the cursor down to to 'Input Control' and then press the top button (tick or check mark). Then move the cursor to the HDMI that has the cable plugged in, and press the top button again to select the cable connection. I know nothing of Apple computers.
Sorry, there was a problem. Please try again later.The specification stated that compatible operation system is WINDOW and not IOS. Maybe that’s why it doesn’t work for MacBook
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