Nvidia geforce gts 250 with problems

A bunch of dots apear on screan! I tested with WinXp, Vista and linux. tried all possible resolutions, the only thing that fixed was changing to 16bit color, but when seeing a movie it apears again. Can anyone help me? this is my sytem:
4.00gb ram
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More about nvidia geforce problems
  1. Is the card new? Did you remove any previous drivers before installing the 250?
  2. Have the card since Setember 2009. it´s a new and clean OS, with the latest drivers.
    were a picture showing the dots:
  3. No one help me?
  4. try down-clocking the card and see if the dots go away
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