Original post by: Dan ,
I’m always torn when someone tries to get one of these going. This series has its issues, I had two! One 15” & 17” This is the series had the famous GPU failure: [https://www.cnet.com/news/apple-extends-macbook-pro-geforce-8600m-graphics-card-warranty/|Bad NVIDIA GeForce 8600M GT chips]. There’s really nothing you can do to fix this anymore as the good chips have long since be used up and anything you find today is a salvaged chip which just won’t hold up very long. That also included replacement logic boards which is what you likely need here. Bottom line shed a tear and look for a newer Unibody model .