[ubuntu] ubuntu 14.10 distorted screen topic

I get distorted screen on my laptop Dell Inspiron 1525 with Intel® 965GM graphics and running Ubuntu 14.10. Couple of pictures are attached.
The screen is ok for 5-10 mins after startup. Then it suddenly goes distorted.

Please let me know if this can be resolved.

Attached Images

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  scrambled_screen.jpg
  (49.8 KB)
  
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  distorted screen.jpg
  (72.2 KB)