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[ubuntu] HP Pavilion dm1 black screen on boot

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http://ubuntuforums.org – Hi everybody, I've done a clean install of Ubuntu 11.10 on my HP Pavilion dm1 from a USB disk. The installation seemed to work fine. When I power on, 1. I get the flashing prompt on a black screen for a second or two, 2. the usual instructions to hit escape for the boot menu appears, 3. Flashing prompt again for a second 4. The top half of the screen might flash with a colour for a split second (red, green or purple usually) 5. The screen backlight appears to turn off, and no activity is indicated, but the computer is definitely still running (power light on, fan running). Very occasion (Hardware)