1. run system in recovery mode 
2. write command : 
mcedit /etc/X11/xorg.conf 

(if there is no mcedit instal mc by : apt-get install mc)

3.find line : 
Driver "radeon" (or "ati")
change "radeon" or "ati" to "vga"
4. write command :
init 5

5. paste here xorg.conf :) and /var/log/Xorg.log (all as attachment -
long files)

:)

-- 
black screen on startup of kubuntu gutsy
https://bugs.launchpad.net/bugs/156429
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