NVidia has a serious problem -- a lot of their chips are failing because of localized overheating. It's worst in the notebook parts because they're more likely to cycle between hot and cold, but even desktop chips have been failing. Lenovo can't fix it with a recall because there are no good NVidia GPUs; the basic design of the entire generation of parts is defective. The best they can do right now is to minimize the problem by increasing cooling, and hope that NVidia eventually solves their problems and can supply good chips.
For more background, read http://www.theinquirer.net/gb/inquirer/news/2008/07/09/nvidia-g84-g86-bad and the other articles linked to in that one.
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