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iMac Intel 27" EMC 2309 and 2374 late 2009 Where I can to buy the video card to replacement in my iMac 27" late 2009?

Here’s the card 27" iMac (Mid 2011) AMD Radeon HD 6970M 2GB Video Card and this will give you the number Apple part #661-5969 to search for it: http://www.welovemacs.com/6615969.html Welovemacs is very proud of it. You would do much better to try to have the card reflowed. I’ve had very good luck with reflows on these. You might call around your town and see if someone locally has the expertise to do it. The reflows not that hard. And on this models it’s not to hard to get to it: iMac Intel 27" (Late 2009 or Mid 2010) Graphics Card Replacement Are you sure it’s the card? Hooked it up to an external monitor?