Hi all, I'm new to computer repair, basically I just want to save my mac. It appears that the graphics card has gone out (it's about 5 yrs. old). Where can I find a good replacement and what would be an appropriate price range? Also, do you have any additional tips for physically replacing it. How can I tell if I need the whole piece or just a section of it? I have seen prices range from $4.00 - $500.00.