27" late 2009 iMac graphics issue

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6 Dec 2007
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706
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cambridge
I have been given a 27" iMac with a 4850 graphics card. The display works ok although is very sluggish while refreshing images in safe mode. Trying to get in to normal OSX results in a total garbled display.
Short of finding a replacement card which seem ridiculously expensive!, is there anything worth a try?
I have read a lot about people baking their cards to reflow solder and replacing thermal materials, any one tried it?
 
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