My led and external display flicker a lot. What to do?

I have a late 2011 MacBook or 15". My MacBook screen/display flickers excessively making the mac completely unusable. I am not sure if flickering is the right term. Some times it flickers and some times turns turs completely blue or black with white horizontal lines on it. This happens once a week and I have to reboot more than 20 times to get this solved.
Same thing happens to my external display monitor which is connected via thunderbolt cable. So this makes it clear that the LED of my Mac is not damaged. I have searched a lot on the forums but couldn't find a solution. If somebody could help me I shall be grateful.

Here are the Images, which show what happens to my screen:
http://i39.tinypic.com/11w68td.jpg
http://i43.tinypic.com/28v934x.jpg

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in4time wrote:
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This question was solved.
View Solution.

Yes.. i think thats what might have damaged it...Notebook should always be completely powered off with the battery out and ac adapter disconnected while replacing any internal hardware..
Shouldnt be a BIOS problem....but still you can check this link..
Restoring the BIOS
Note:
If you have HP Support Assistant installed on the computer(The Blue Question Mark) then open it ==> Complete all pending Updates & Tuneups==> Restart and Check. It may solve your problem
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**Click on “Kudos” Star if you think this reply helped** Or Mark it as "Solved" if issue got fixed.

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