Green Dots on Apple Cinema Display - Solution!
I spent literally one day (approx. 10 hours) trying to solve my problem with green dots showing on my new Apple 23" HD Display after it woke from sleep mode.
I tired everything possible to fix the problem:
-One hour on the phone with Apple tech support
-Reset Apple's Parameters memory (PMU, VNRAM)
-Completed an extensive Apple system hardware test (All tests passed)
-Bought an extra fan that I mounted inside my G5 tower to provide extra cooling for the graphics card because I thought the card was overheating (not the case)
-Updated Fireware to 5.1.5f2
-Took my G5 tower and display to a local Apple store to test on different monitors and computers - that testing concluded that my graphics card was the problem
-Took out and reinstalled the graphics card several times
-Checked all connections and used different AC to DC adaptor that comes with the display
-Downloaded the "Retail Update" driver from ATI website
None of these things worked.
Then I went back to the ATI website and downloaded the driver "ATI Displays Panel". This solved the problem.
Note: The release notes for this driver do not mention anything about it solving the "green dots" problem, so I was hesitant to download it.
I hope at least one person can use this to save them much time and frustration.
PowerMac G5, Mac OS X (10.5.2), 2003 G5, 1.6; ATI Radeon X800XT graphics card