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I have a Late 2015 iMac running macOS Mojave. I am looking to disable the main display and use an external display as the primary/default display.

I am looking for a command-line that can do that. I want to try and fix my CPU kernel_task problem. My display is broken and even with new one it doesn't talk to motherboard I verified via Apple.

When I use external display, computer works just fine besides the kernel_task taking up a lot of CPU/RAM. My understanding is that disabling the display may fix the issue?

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