Please attach your /var/log/Xorg.0.log and the output of 'lspci -vvnn'.
Also, try disabling compiz (such as via chmod a-x /usr/bin/compiz) and
see if that makes it start up properly.
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: New => Incomplete
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ati RV610, black screen at logon screen on 1st boot after install
https://bugs.launchpad.net/bugs/273510
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