I was lucky enough to get my late 2007 17" MBP motherboard replaced recently for free by Apple. I was out of warranty since January 2012 and had the black screen 3 months later. But after insisting a lot, escalating the issue to Applecare and CR departments, and praying a lot, they did an exception

. Though my MBP had to pass previously a test to prove it was a GPU issue... You could always try your luck...