External display only works with Macbook open?

I have an Acer AL2623W which works fine as an additional or main screen, but a second after you close the laptop the screen goes blank and it shows an 'input not supported' error. The Macbook stays on, it just doesn't drive the monitor alone. Re-open the Macbook and both work normally!

Hello Siôn Dafydd,
Welcome to the Apple Support Communities!
I understand that you are using an external display with your MacBook Pro and when you close the display on your MacBook Pro, the second display turns off. It sounds as though your MacBook Pro may not be connected to power while using with display closed. Please read over the attached article for information on using a second display in closed-clamshell mode.
How to use your Mac notebook computer in closed-clamshell (display closed) mode with an external display - Apple Support
Have a great day,
Joe

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