Persistant Screen Flicker

3 Genius Bar appointments couldn't solve it - my last chance before I implode is you guys!
At random, anywhere from 0-10 times a day, the screen on my 15inch late-2008 MacBook Pro flicks on and off for a split second. Not a huge problem, sure. But it's really starting to get on my wick.
Geniuses have gone through 2 displays and 2 top cases (totally EIGHT trips to the Bar in one month!) and the problem still persists.
I've checked to see if the problem continues with both graphics processors and it does. Does anyone have a potential solution, any idea what the hardware issue might really be or what my chances are of getting a full-on laptop replacment for this problem?
Thanks,
Sam.

Have you tried an external display? Does the flicker persist? If so, you may have a graphics chip glitch of some sort rather than a display problem. If the problem is very intermittent, it may not show up on the Apple Hardware test or any other hardware test. I assume you or Apple did run the extended version of the AHT or something similar?
It sounds like you have been through 4 expensive repairs and the problem is not fixed. It may be that a logic board replacement would fix the problem, but then again, that would be a very expensive repair.
You might try speaking to the Apple Store manager about this and explain that 4 very expensive repairs have not been able to fix your problem and that you feel you have a lemon and ask if it is possible to get a replacement machine.
In view of what this one must have cost already in repairs, it is time to make the logical argument that it would be cheaper in the long run for Apple to supply you with a new machine than to continue to pour money into this one. Be nice and polite, but be clear that it is unreasonable to have to keep coming back trying to get this machine fixed.
If no joy at the Apple Store, you could also try calling Apple and ask to speak to Apple Customer Relations. It's possible that they could authorize a replacement machine, but you really should try the store manager first.
Good luck!

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