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White screen on Laptop but normal with external monitor.

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robo_dev

Is the screen white at the instant of power-on? (can you see the Dell logo and BIOS boot options screen)

If it's white from power-on, that sounds like the video controller on the motherboard is flaky. If you do a BIOS factory reset, and you've got a white screen from power-up, that sounds like either the motherboard or the display itself or it's cables.