[ubuntu] ubuntu fails to boot

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http://ubuntuforums.org – Hi all. I seem to need help. Overnight, my ubuntu installation appears to have developed a major problem. It fails to boot. To be more exact, the computer starts normally when switched on, but it takes ages for the GRUB screen to appear. Once I choose for it to boot in Ubuntu, it switches to a purple screen (no loading indicator, just purple), or occasionally to a black screen with a flashing cursor. After that, nothing happens. I have tried to boot through recovery mode, but that does not work either. This problem occurred suddenly, literally overnight. I think the evening before (Hardware)