01-18-2012 04:21 AM
From your Model series, I would assume the issue is with the video chip and reflowing the chip can work for an unpredictable amount of time. Quite a few people have had a good result from the service offered on the link below and they do fit a copper shim to allow better cooling of the chip ( heat being the main cause of the problem in the first place ).
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Microsoft MVP - Windows Experience