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I recently got a Nvidia 660 as a new graphics card as my old card was a ATI 4600 and when I tried to use my USB key to upgrade to ubuntu 13.04 all I get is a black screen with a small pink line on the left side of the screen and it freezes right there I don't know why this happened because the only thing changed was the Graphics card and when I was using the ATI card I I never had this problem can anyone help me on this problem