crwdns2934241:0crwdne2934241:0 R Janssen

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My MBP's video is not good. it keeps freezing up

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When it freezes up, I have to restart it.  Then it freezes up again. I think it's a problem with the GPU. How should I fix it?

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MacBook Pro 15" Core 2 Duo Models A1226 and A1260

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open