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I guess my case is desesperate and i don't know where to start so If there is some expert this is the big problem.
1- When pc start i got The system is running in low graphics mode.
2- Then any options selected after work ( run in low graph mode, reconfigure graphics, troubleshoot the error, exit to console login)
3- the only action "working" is exit to console login and in this case black screen, impossible to write anything.
4- I can press power button and then reboot of the computer.
boot cd of 12.10 not taking into account when reloading ...
I really don't know where to start and how to proceed