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About the Mac:

Mac OS Mojave
Version 10.14.4 (18E226) 
MacBook Air (13-inch, 2017)

I wish to connect two external monitors with following specifications with my Apple device.

one pure HDMI 
other VGA (converted to HDMI using a VGA to HDMI Adapter)

My device has one mini-display port. I have bought a (not an apple product) 3-in-1 mini-display port to (DVI, HDMI, VGA) adapter.

I have two options to connect.

1. Connect pure HDMI, VGA based monitors into one 3-in-1 mini-display port adapter. (FAILS!)
2. Connect the pure 3-in-1 Adapter to a splitter (another device that accepts one HDMI input and spilts into 4 HDMI outputs) using HDMI cable and then connect the two monitors using HDMI outputs. (WORKS!)

The second method is able to connect two monitors but my Apple device shows only one device connected in Display Settings and the two external monitors mirror each other but I want a chain display.

Any help?

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The 2017 MacBook Air does not natively support dual external displays. When you connect a monitor through the mini-DisplayPort, you'll only get a single display. Even when using the splitter - you'll always get a single display mirrored across both monitors.

The 3-in-1 mini-DisplayPort adapter is meant for converting the DisplayPort signal to one of three other signals - but only one at a time!

I would suggest using your existing adapter to connect the HDMI monitor to the MacBook Air using the mini-DisplayPort on the MacBook Air. Then buy a DisplayLink VGA adapter for connecting the VGA monitor to the MacBook Air's USB-port. Note that this display won't have the same performance as the built-in display and the HDMI monitor - so if you're using this for intense gaming applications, you'll probably want a different computer.

  • "Then buy a DisplayLink VGA adapter for connecting the VGA monitor to the MacBook Air's USB-port." I want to use it for programming purposes. Have you tried it? – Inquilabi May 7 at 10:37
  • Yes, I have used DisplayLink VGA adapters before... – jksoegaard May 7 at 14:01

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