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Thanks for the reply. I'm currently running Lion, 10.7.5

Firstly, let me say I am a total novice when it comes to removing and replacing computer parts, and have no idea of the terminology I should use. I can swap out RAM chips, but thats about it. Anyway... My 2008 Mac Pro ATI Radeon x1900 GT 256MB PCI-Express Video Card failed recently, so I...