Fuzzy screen on startup

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http://unix.stackexchange.com – I recently started getting a fuzzy screen on start up. The best way to describe it is to say the screen looks like it has a H-Scroll problem - fuzzy horizontal lines. The mouse pointer is stable however. My current work around is to log out and back in, then I get a nice stable login screen (difficult to do since you are clicking on menu items you cannot see properly). I´m looking for a permanent fix. (HowTos)