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Computers automatically default to the built-in display on power-up. It's part of the BIOS (binary in/out system) & POST (power-on self test) routines. That's simply because it's 'logical' for the computer to need to use the display it was provided with at manufacture. The only way to make it default to an external display - would be to have the computer automatically detect if an external monitor is plugged in. That would require extra software.

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Q: Can you make it where your laptop automatically switches to an external monitor when you turn it on without having to manually switch to it?
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