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Ubuntu powering on and turning the monitor off

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linux-howto

http://askubuntu.com – So, my problem is that when I turn on my laptop and it starts booting Ubuntu, the monitor goes on and off a few times. When it reaches the state where the system is loaded and should start working, the monitor on my laptop is black, nothing on it, not sure if it's turned on even. After that, I plug in an external monitor, and my laptop monitor starts working. I plug out the external one, and everything is still okay and I can do whatever I want. How can I stop my system from doing that? (HowTos)