Screen turns white with black dashes making diagonal lines

i'm pretty computer savvy but i've never seen this before. my pavilion dv9500 running windows 7 ultimate x86 will randomly freeze to a completely white screen, with black dashes across the screen that make parallel diagonal lines. the only solution is to force the computer off with the power button. has anyone experienced this or knows why it is occuring?
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  1. Never seen it before, but i am sure its a Driver issue, try updating VGA drives to latest.
  2. what video are you using.?
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