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Troubleshoot PC Screen Problems
Almost everybody sees an occasional problem with how their PC screen appears – a flicker here, a bit of snow or temporary distortion there. As video changes modes of operation, it's not unusual to see something odd. The question is how long the problem lasts. If it's instantly over, there is usually no cause for concern unless it quickly repeats. If the problem instead seems to deepen or worsen over time (and you shouldn't allow this to go on indefinitely), you need to check this out.

  Tutorials
  Hazy Display at Boot
  Bad Display Post Adding
  Color Spots at Screen Edges
  Screen Sometimes Too Dark
  Distorted Display
  Thin, Scrolling Lines
  Display Image Appears Tilted
  Monitor Warns, Display Shifts
  When Display Looks Pink-Tinted
  Blue-Tinted Display
  Top Lines Appear Larger
  Screen Image Rolls
  Screen Appears Too "Fat"
  No Picture on Monitor