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Possible Duplicate:
My computer boots to a black screen, what options do I have to fix it?

I've just installed Ubuntu and i can't access the desktop because the screen sometimes flickers and sometimes it gets black.

Here are my PC specifications:

  • Gigabyte z68a-d3-b3 motherboard
  • 4 Gb Kingston RAM
  • AMD radeon HD 6850 graphics card
  • Intel i5 3.4 GHz processor,

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