Start up screen purple tint, won't boot, then vertical blue lines

I'm having trouble with my macbook pro late 2011 model running maverick
When I try turning it on I get a start up screen with a purple tint then the apple logo just disappears and the entire screen is with that purple tint (see pic below, sorry if tint isn't too visible and also for the upside down pic, this pc is driving me crazy)
Then when I try booting in safe mode the screen suddenly turns to a screen with blue vertical lines as below.
Funny thing is that a few days later everything went back to normal, then a few weeks later happened again. Now third time it's happening. I also notice once or twice the fan was working hard prior to computer freezing... perhaps not related not sure.
Took it to an apple service center and they tested for 3 days and werent able to come up with solution they ordered a replacement display and in a few weeks will replace. They say if that doesn't work they'll have to replace the video card..
Anyone have any clue what this might be?
When I called Apple support they were inclined to suggest it's defective memory non apple, but I don't see that to be the case...
I'm overseas and can't bring in to apple store.. thanks

Thank you
Where I'm currently located no local apple only a authorized service center... brought to them and they decided to order a new display panel. I have to wait two weeks til they get it then if that doesn't work they'll order a new motherboard..
They ran a series of tests on the notebook for two dates... wouldn't they have uncovered if it was memory related?

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reboot
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crw4096 wrote:
Is this a dead disk?
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see > Apple - Find Locations

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purplesunshine3 wrote:
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