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  • 1
    Is your monitor a CRT?
    – Earlz
    Commented May 7, 2010 at 20:37
  • 1
    flat panel LCD.
    – BCS
    Commented May 7, 2010 at 20:48
  • i got heavy flickering when trying to log into two xservers on the same hardware (laptop LCD, ati mobility radeon, one user into Xubuntu session and a different into Ubuntu/Gnome session, Ubuntu 10.04). thre are a lot of different variables that come into play and troubleshooting gets ... complicated. Commented May 7, 2010 at 23:32
  • Sorry not a Linux user so excuse my ignorance... is this not a screen resolution issue? that's why it goes away with a different monitor; try reading the manufactures recomended refresh rates to see if you can set your video setting to that of the monitor. Possibly your .CFG file is setting the resolution/refresh to it's own parameters. Also try pressing the auto button on the monitor it's self this will fix basic/ reset to default which can help eleviate other issues /possibly.
    – Iceking007
    Commented Feb 18, 2011 at 15:05
  • This behavior is sometimes caused when you insert a modeline manually or alter its parameters.
    – DrNoone
    Commented Jul 5, 2011 at 19:18