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chscag

 
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Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 38,400
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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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Run the Apple Hardware Test on your machine: Link

You should also probably do a check of your hard drive for file errors, bad sectors, and so forth. Boot the machine with your original install media and run Disk Utility. Do a verify and repair of the hard drive. Keep repeating the repair process until all errors are cleared (if any).

The graphics card in your G5 likewise can be acting up. Sometimes the Apple hardware test will not pick up on an intermittent problem so do not rule out a bad GPU.

Regards.
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