The x700 doesn't work with the ATI open source driver yet. So you must use vesa as generic driver or the proprietary fglrx driver from ATI/AMD, which has 3d support. The problem is that, the default configuration, brings the unsopported driver, which leads to the blank monitor. You must always edit /etc/X11/xorg.conf and change the driver to vesa/fglrx, in order make it work(fglrx may not be available! "apt-get install xorg- driver-fglrx" for it to work).
-- Black screen with a ATI graphic card https://launchpad.net/bugs/62413 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
