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harryb2448

 
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Member Since: Nov 28, 2007
Location: Nambucca Heads Australia
Posts: 18,308
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Mac Specs: iMac i5 2.7GHz, 16GB memory, OS 10.10.1

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Yes all points to gfx card. The 7300 were not a strong card and it may well need replacing. Regarding Tiger discs, are they the ones that came with the computer when new? Mountain Lion will not install without very severe hackintosh mauling.

The 5770 will work well. Lion will install and run nicely though more memory will help greatly.

Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!
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