Screen going crazy, pink horizontal lines, frequent random crashes?

Hi all,
First post here... I felt compelled to post as usually Googling a problem will bring me to a solution from one of these discussions but in this case there are many similar instances of my problem but no-one seems to be able to offer an explanantion that fits my particular circumstances.
I have a late 2011 MBP 15"
Processor = 2.2 GHz i7
Memory = 4 GB 1333 MHz DDR3
Graphics = Intel HD Graphics 3000 384 MB
OS = OS X 10.9.2
Recently, my screen started randomly going crazy, all blocky and with horizontal pink lines all over. Then it would go either fully black or fully white. This usually happens when I open another tab or app. Sometimes it crashes and powers off. Sometimes it restarts.
If it powers off and I restart it or it restarts itself, the horizontal pink lines appear on the startup/spinning gear screen.
Then the screen goes fully white and the fans go crazy. Now it sometimes just stays hung like this and sometimes it powers off after about 3 minutes of crazy fans.
I switch it back on and it does the same thing.
It gets stuck in this loop for ages and often, if I just leave it and come back to it some other time, it powers up just fine however sometimes it will continue to refuse to power up.
If I try to boot into recovery mode, it blue screens.
If I try to boot into safe mode, it blue screens.
If I try diagnositics, it blue screens.
What could the problem be and how do I fix it?

I've had a similar issue with my mid-2012 13" non-retina MacBook Pro twice. First time I dropped it and it fell hard ( I mean it fell down a flight of stairs). It sounds like your graphics card and/or logic board and possibly the RAM sticks might have an issue. For me, a new logic board costs about $480 but Apple covered it twice since its less than a year old. Other issues I've had it would have a "checker-board" on startup and it would have a similar glitch when I would move it or set it down. It would also freeze and even shut down. I've also pulled it out of my bag, and it would be a lot hotter than when I put it in. I'd say set up a Genius Bar appointment or take it to a local certified apple service technician or if you really wanted to, setup an appointment and find out what's wrong and then repair it yourself, just make sure your data is backed up. I would suggest back it up to both iCloud and an external hard drive that can hold more data than the internal drive on your mac.

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Screen going crazy, pink horizontal lines, frequent random crashes?

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