No video after choosing fedora in grub.

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http://forums.fedoraforum.org – Hello guys, today I got a sad problem: When I run fedora (liveCD), it works properly but then I install it (the installation process seems to be ok) and by the moment I choose fedora in grub, what I got is just a white-blinking screen that never ends. So I tried to install many others DEs and distros: Fedora(KDE), Fedora(LXDE), Mint(Cinnamon), Kubuntu, Lubuntu, Mageia, OpenSuse and the same problem appears: everything works as LiveCD but not after installation on hard drive. I don't know what is wrong, however, I'm using a ATi VGA (hd6670) and i've read that ATi graphic cards are often g (HowTos)