Screen discolouration when black

For about two weeks I have an issue with my screen on my MacBook Pro (2011). When I'm watching a video and the screen is dark, in the centre of the screen I can see blue and white discolouration. If I look closely in the white area, there are black dots present. They are not visible when the screen has something white or bright coloured playing. I haven't tried internet searches, but haven't found any similar problems. I am not computer savvy.
Thanks for any advice/suggestions.

Sorry- * I HAVE tried internet searches

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<pre><nowiki>body { overflow-x: scroll !important; }</nowiki></pre>
* Stylish: https://addons.mozilla.org/firefox/addon/stylish/

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It may even be the screen, no way of knowing for sure until you eliminate one potential cause. At least the inverter is cheap.
Directions here: http://www.ifixit.com/Guide/Installing-MacBook-Core-2-Duo-Inverter/1497/1
The part costs ~$5 on eBay.
Search here: http://www.ebay.com/sch/i.html?_nkw=macbook+inverter+-pro&_trkparms=65%253A12%25 7C66%253A2%257C39%253A1%257C72%253A5317&rt=nc&_sticky=1&_trksid=p3286.c0.m14&_so p=15&_sc=1

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Triple-click the line of text below to select it, the copy the selected text to the Clipboard (command-C):
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My computer Spec:
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Screen discolouration when black

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