Quote:
Fatal server error:
Server is already active for display 0
If this is server is no longer running,remove /tmp/.xo-lock and start again.
Invalid MIT-MAGIC-COOKIE-1 keygiving up.
xinit:Resource temporarily unavailable (error no11):unable to connect to x server
xinit:no such process (error no3):server error
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The above is telling you that, basically, xserver is already running. When you use CTRL+ALT+F2, all you're doing is switching to a virtual console. Xserver is still running on vc7. Instead, if the screen's blank, hit CTRL+ALT+BACKSPACE. This will shutdown x. This isn't really related to the problem.
For the blank screen issue, choose the Ubuntu recovery mode option from the GRUB menu. Login and then type startx. What happens?
Also, what video card are you using?
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Arch64 ~ PekWM