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MacBook Pro - How to use external monitor right from boot/login screen

My macbook's display is not working, and it just shows some lines for most part of it. But I can see(barely) it is booting and waiting at login. I want to connect it to external display and take a backup. The problem is that the external display becomes secondary display and I do not see the login prompt on it to work.

Is there a way to make the external display the primary display or to mirror display using some keyboard shortcuts, as I cannot see whats on the screen at all?

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Solution retenue

If you have access to a USB or Bluetooth keyboard & mouse. Restart your system and then close the lid so the lid sensor acknowledges the lid is closed your external display should automatically become the primary display.

If this fails you may have something deeper here than just a messed up LCD.

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Brilliant! Worked for me.

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You need the magsafe in and power on too. It doesn't work from battery.

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Worked for me

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worked for me too :)

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Here’s a guide on how to do so. Pretty cool guide in my opinion!

http://osxdaily.com/2010/12/21/broken-ma...

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@ajcooke01 - Be careful! This guide was for the older A1211/A1212 MacBook Pro. The newer MacBook Pro retina series are a bit different. I wouldn't disconnect the display lid as you would loose Bluetooth & WiFi

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@danj I didn't say to disconnect the lid, it was just in the very unlikely case the OP would actually do something like that.

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I'm trying to connect Mac book pro 2019 from usb c to HDMI cable to Samsung TV before login. But it's not detecting in TV even after connecting charger and closing lid. Any idea why?

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Try a different port, adapter and/or cable as one is not working properly.

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Harish sera éternellement reconnaissant.
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