Apple issued a statement today that some of its MacBook Pro notebooks that were shipped between approx. May 2007 and September 2008 may be failing at higher than normal rates due to a packaging defect with NVIDIA GeForce 8600M GT GPUs.
If you have a 15" or 17" MacBook Pro with a GeForce 8600M GT and get distorted or scrambled video or no video at all on the computer screen you should check out this page at Apple to see how you can get your laptop fixed.
In July 2008, NVIDIA publicly acknowledged a higher than normal failure rate for some of their graphics processors due to a packaging defect. At that same time, NVIDIA assured Apple that Mac computers with these graphics processors were not affected. However, after an Apple-led investigation, Apple has determined that some MacBook Pro computers with the NVIDIA GeForce 8600M GT graphics processor may be affected. If the NVIDIA graphics processor in your MacBook Pro has failed, or fails within two years of the original date of purchase, a repair will be done free of charge, even if your MacBook Pro is out of warranty.