Apple gurus please help. GPU problems

Hi everyone. Having a horrible gpu issue and cannot find a solution anywhere. I have one of the 2008 Macbook Pros with the dreaded 8600 gpu. If I run any OS past 10.6.3 I get artifacts on my display. But, with 10.6.3 all is pretty much ok except for watching movies from dvd or my drive. youtube video no problem full screen. The minute I go to 10.6.8 it's back to artifacts on certain web pages and youtube video. Lion to Mavericks I get artifacts on EVERYTHING. It seems to me that something in the 10.6.8 update and up is taxing the faulty gpu but I cannot figure out what. I don't mind sticking with Snow kitty but would like to have at least 10.6.8 for iTunes 11 so I can use my iphone sync. Any ideas or solutions? I tried updating to 10.6.8 and then using the old 10.6.3 video kexts but that didn't work and I had to reinstall. And I can't afford a new Mac or repair right now. Thanks in advance!

Make an appointment at an Apple store genius bar and have them test you MBP and define what is exactly wrong with it.  The evaluation will be FREE!
Ciao.

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