Screen turns pink and flickers

Hi everyone,
I've got a little problem:
My screen randomly turns pinks and then starts flickering and then a few moments later it stops for a few minutes and then begins the process again.  I have no idea how it began. I have a MacBook Pro 10.6.8.
It would be great if anyone knew how to solve this answer.
With regards,
Jean-Pierre

Apple Hardware Test doesn't catch everything, so even if it doesn't find a problem, you could have one.
Apple Hardware Test
Apple Hardware Test – Invoke and Interpret
Apple Hardware test – How to run and interpret (2)
Apple Hardware Test - Using

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