It happened when I was getting rid of OS-X Lion and just reinstalled Snow Leopard.
The MBP booted up with its startup chime, but there was nothing on the screen!
Like a good Apple user I reset the PRAM and the NVRAM, no go; I then connect the MBP to another screen, still nothing!
A search in Google confirmed the fault most likely was caused by the Nvidia fiasco!
According to Apple:
"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 four years of the original date of purchase, a repair will be done free of charge, even if your MacBook Pro is out of warranty."
|Happier time... my MBP driving the Viewsonic VP2250wb 21"|