Vertical stripes appears and then system freezes

This is a ridiculous issue I am having from last 3 days. It started with nothing in specific but the I suddenly had these vertical stripes about an inch wide on the screen and it froze after that. I went to genius bar and he started the system in safe mode and it runs normally in safe mode but safe mode does not have all the functionality. I can't wrap my hear around this conflict that it runs properly in safe mode and it doesn't in normal mode. The repair is going to cost me a fortune. So, I am looking for some alternative solutions.
P.S: I have done the following things so far:
1. running hardware test - it says everything is okay.
2. wiping of PRAM - in fact did it several times.
3. from some other forum tried fsck too.
The image of the screen is as follows:
http://tinypic.com/r/29uszk9/6

Most likely culprit is bad RAM (hardware test results aside). Try opening up your MacBook and pulling out one stick, then the other, swapping them even, and see if you can isolate the problem that way. If this is Apple factory RAM, Apple should replace it if you are still under warranty.
If it's not the RAM, then it would be your graphics card, necessitating a motherboard replacement.
Good luck!

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Vertical stripes appears and then system freezes

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