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chscag

 
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Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 40,114
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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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System freezes are usually associated with a hardware problem. First suspect is memory. That should be easy enough to check either with software or by substitution. A free memory checker can be downloaded from here.

The second suspect is the graphics processor. Since that's hard wired on your G5 logic board, about the only thing you can do is run the Apple Hardware Test to see if it shows up with an error. See this LINK.
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