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my ubuntu 12.04 freezes on start up after I changed graphic card. Previously I had Ati Radeon saphhier 6850 and everything was ok, then I removed it and put some old nvidia graphic, and even then it was ok, and now I got new one, Ati Radeon Saphhire 7850... Ubuntu loads untill welcome screen then it freezes, mouse is working but interface is unclickable, and lower right corner says amd hardware unsupported. I need to do hard reset. Any help?

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I did it. Here is how: Restart machine, go tu Ubuntu 12.04 Recovery mode, then choose root and enter: sudo apt-get remove -- purge nvidia-* hit enter, when asks type Y and hit enter... then reboot and that is it.... –  Igor Stakic Mar 5 '13 at 18:27
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1 Answer

You must install the proper driver for your video card. In order to do that go to AMD website and download the proper file, then reboot your system and choose recovery mode and try to install the driver from command line. Don't forget to remove the previous driver for Ati.

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I have Ati radeon 7850 now on board.... –  Igor Stakic Mar 5 '13 at 17:29
    
Oh sorry :D I am going to edit ... –  Mostafa Shahverdy Mar 5 '13 at 17:30
    
and please, be more specific coz I am new to ubuntu –  Igor Stakic Mar 5 '13 at 17:32
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I have done it. Thanks for tip! –  Igor Stakic Mar 5 '13 at 18:26
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