Guys if you have a dead or distorted video when using your 2600xt card go to your apple store and have it replaced for FREE even if your MP is out warranty.
http://support.apple.com/kb/ts3630
They've already replaced 2 of my 2600xt, some "geniuses" don't even know this, some store requires the MP be brought in when you pick up the replacement part coz they want to put the card themselves (maybe they just want to make sure you actually have the MP ) some don't.
I still have one running but I have untill june of 2012 to have it replaced (bought the MP in june 09)
http://support.apple.com/kb/ts3630
They've already replaced 2 of my 2600xt, some "geniuses" don't even know this, some store requires the MP be brought in when you pick up the replacement part coz they want to put the card themselves (maybe they just want to make sure you actually have the MP ) some don't.
I still have one running but I have untill june of 2012 to have it replaced (bought the MP in june 09)