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In my experience there is no substitute for having a BGA chip resoldered with the appropriate equipment.
I have an HP TX1000 laptop which had a flaky NVidia GPU (common problem on those and other laptops including other HPs and some Toshibas). It started blacking out the video and losing network connectivity, then eventually got to the point that it would not even show the startup splash screen. The GPU is a BGA chip. I tried a recommendation of cutting out a piece of cardboard to mask the GPU, covering the cardboard in foil and hitting it with a heat gun. The laptop started booting again, but it only lasted about a week before it died again.
I sent the motherboard off to a shop in Miami that has the proper BGA resoldering gear (including x-ray to check the soldered connections). It cost $100 plus shipping to have a new GPU soldered in properly. Since I got it back from them in 2010, the laptop has not given me a bit of trouble. The shop I used will only work on specific model laptops.
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