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I am trying to install a new graphics card on my system and the screen comes up flashing, with the screen split in the middle.

The left edge of the screen meets the right edge of the screen in the middle.

Any suggestions?

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When I attempt to signin, all I get is a blank flashing screen with no right mouse events. I can't use a terminal to load the drivers. – Ray Madigan Apr 29 '12 at 5:19
Before your question can be answered, can you confirm what version of Ubuntu you are using also when you installed the new hardware what drivers did you install? Did you use the Ubuntu binaries or did you install the latest AMD Catalyst? – stephenmyall Jul 11 '12 at 19:08

i have the same graphics card, amd-radeon 6670 manufactured by msi and amd a6 apu.

After installing 12.04 (amd64) I had to boot in recovery mode.

First choose Networking option to establish connection and remount hard drive in r/w.

Ctrl-D back to menu and choose the root console option.

Use apt-get update then apt-get dist-upgrade.

While possibly extraneous I update my initramfs and update-grub before rebooting.

Proprietary Catalyst driver worked pretty well, search for fglrx wiki and follow the distribution specific install guide.

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-1 Why are you suggesting a distribution upgrade when its not clear what distro is being used. Aslo there are good guide here at AU for installation of the proprietary catalyst, but leveraging the Ubuntu binaries maybe sufficient – stephenmyall Jul 11 '12 at 19:19
@StephenMyall sudo apt-get dist-upgrade does not (by itself) upgrade to a newer OS release. sudo apt-get upgrade will never upgrade any packages that require any package to be removed or any package not already installed to be installed. sudo apt-get dist-upgrade is the way to upgrade packages that do require those operations to be performed. It's originally called dist-upgrade because in other OSes like Debian where you do a release upgrade with apt-get/aptitude, you run that after modifying /etc/apt/sources.list. This answer is not saying to do a "distribution upgrade." – Eliah Kagan Jul 11 '12 at 19:30

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