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,