Linux - T420s crash with screen flickering

Hello all together,
I have a strange problem with my Linux Mint 15 running on a Thinkpad T420s.
Sometimes while doing graphic intensive stuff, like watching movies, the system crashes and i get only colored flickering on the screen (as seen in the image:http://i.imgur.com/xPUkvVu.jpg).
After about 15 seconds the system shuts down. After this i can normally start the system and everything works fine. 
The logfiles don't show any usefull information on the crash.
I experience this issue with several kernel versions. Right know i am using Kernel 3.8.0-19-generic.
I also already tried several different versions of the i915 driver module.
Does anybody else have similar problems or does somebody have a hint on how to solve this issue?
Thank you in advance,
Loranon

The RAM is not the problem.
I've restored the original memory, but the problem persists..
Anothers guys with the same or similar problem with Mac OS X Lion?
Any idea?
Thanks.

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