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My screen went blank after I booted for the 3rd or fourth time into Ubuntu. I have installed it through WUBI and the first boot was perfect. I have checked and its not the brightness problem.

I have no option but to power off the laptop and then restart windows.

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Please edit your question to indicate which version of MS Windows is being used. –  user25656 Jan 12 '13 at 18:37
Please also indicate how you determined that it's not a brightness problem, whether you installed any graphics drivers, what your graphics card is, and whether there were any other problems when it did boot normally the first few times. –  bcbc Jan 12 '13 at 20:12
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