Thanks for your tips. I tried it but it did not fix the issue. The laptop works, I mirrored the internal and external screens. Thus I can use it. But even if I can set the brightness of the internal screen, it does not display anything. The apple customer care said it is not the NVIDIA issue unfortunately. They said the screen has to be changed. Any advice?
I think I found the issue: http://support.apple.com/kb/TS2377 Symptoms 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. What to look for: (1) Distorted or scrambled video on the computer screen (1) No video on the computer screen (or external display) even though the computer is on Specific products affected: (1) MacBook Pro 15-inch and 17-inch models with NVIDIA GeForce 8600M GT graphics processors o MacBook Pro (17-Inch, 2.4GHz) o MacBook...
