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chscag

 
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Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 38,488
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Mac Specs: 27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, 3 iPods, OS X Mavericks

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Which Powermac G4 do you have? There were many models of that machine. In any event, if the graphics card is defective you would need to get an exact replacement or a good substitute. There is no way that Best Buy will have a graphics card for your machine. You'll have to buy a replacement from a Mac parts reseller.
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