Are you running live CD or is this an installed version? If the latter, you can use <ctrl><alt><F1..F6> to go to a terminal. Login and check /var/log/Xorg.0.log for errors (lines starting with EE).
Which videocard is in your system? And which monitor (make and model). Can you post the sections device, monitor and screen of the x configuration file (/etc/X11/xorg.conf probably)?
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