Sounds strange that the livecd would work but the installed system not.
Anyway, please attach your /var/log/Xorg.0.log and /etc/X11/xorg.conf
and we'll investigate it further.
** Changed in: xorg (Ubuntu)
Status: New => Incomplete
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Hardy 4 does not recognize screen on Asus G1S
https://bugs.launchpad.net/bugs/190198
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