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harryb2448

 
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Member Since: Nov 28, 2007
Location: Nambucca Heads Australia
Posts: 17,704
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Mac Specs: iMac i5 2.7GHz, 16GB memory, OS X.10

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You do not state what model machine you are using in your avatar, however if it is a desktop, open her up and make sure the graphics card is seated firmly, and if so is the fan unit, if installed, starting up on bootup as they do fail and fry the cards.

Next pop in Apple Hardware Test and let it run the full program. Graphics, pixels etc are included in the final test.
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