Mac has a bluish tint to it, just happened last week

Hello! My Mac is a refurb, early 2011, I got it in the September. It's always run a bit low, because it's only 4gb. But a few days ago the browsers turned a bit, well, grey. Sometimes a bluish colour. ColorSync says no problem. I need to know if I'm losing my marbles! Perhaps it's always had this grey tint thing, but the blue is most odd. It doesn't happen all the time; just sometimes, when I load a page, the browser goes blue for several seconds. Screen grab here: http://tinypic.com/r/zjf7mq/8
It's not harming anything, I suppose, but I wonder if it's the beginning of problems for the Mac. I've already started thinking about buying a new one and flogging this one...

"MacBook Pro (15-inch Early 2011), OS X Mavericks (10.9.4)"
So there's a recall on this model. Run your serial number here to see if you're in the recall pool.
Since it's a refurb it might be different but it that's actually the original date of manufacture it should be one of the ones affected.
Apple Recall:
https://www.apple.com/support/macbookpro-videoissues/
Take it to the Apple store and they'll run tests on it. Make sure they run the tests many times. Sometimes it twakes a while to get the diagnostic to kick our an error code.

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