MacBook Pro errors due to bad NVIDIA hardware?

MacBook Pro errors due to bad NVIDIA hardware?
Long-standing graphics errors in MacBook Pros may be directly attributable to faulty hardware from NVIDIA, reports say. Although NVIDIA has denied accounts of problems in its G84- and G86-based mobile graphics cards, other sources say they have learned that all cards with the chips — including the GeForce 8600M GT used in MacBook Pros — may be p…