HT4044: About LCD display pixel anomalies for Apple products released in 2010 and later
Learn about About LCD display pixel anomalies for Apple products released in 2010 and later
Q: Red and green square dots?
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Dec 5, 2013 10:33 AMby BillyHoush,I have the same issue with my 27" mid-2010 iMac. Apple has replaced the video card, then the logic board, and now they seem to be doing it all over again trying to resolve the issue. However, I found out from a genius posting on a different message board that he had the same issue with 2009-2010 27" iMacs and it turned out to be the DC-to-DC cable from the power supply to the logic board. Apparently it's a cheap part but takes a long time to replace because the cable runs behind everything in the machine.
I'm attempting to contact the genius bar folks working on my imac to tip them off about the DC-to-DC cable. I will post with my results.
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Dec 6, 2013 7:43 PMby dgd2000,Add me to the list of frustrated iMac owners with the intermittant red and green square problem. It just showed up today on my 27" 2.8GHz Quad Core I5 (October 2010 vintage) running Mountain Lion. The problem is intermittant and goes away when a window opens or slides over the offending area of the screen.
The nearest Apple Store is 3.5 hours away, so "dropping in" to have the Genius Bar guys look at it is out of the question. This is FRUSTRATING!! I hope someone identifies a sure-fire way to identify the source of the problem. Better yet, I hope Apple comes forward with a solution!
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Dec 6, 2013 7:56 PMby Crow8ster,I Fixed It Permanently!
Had the squares for months and then I uninstalled Google Chrome and Avast Antivirus and then I did a PRAM/SMC reset (Do a google search to learn how to do these). I have had no squares at all since November 13. I have thrown everything at my IMac since and still I have had absolutely no return of the squares. I am considering this problem finally fixed for my Mac.
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Dec 7, 2013 6:59 AMby jack fox,PRAM/SMC reset is one of the things I tried awhile ago and it wasn't a permanent fix. I do believe Google Chrome hastens the onset of the problem, but the solution involves fixing a manufacturer defect; and since Apple's creations are inherently proprietary the solution is an Apple decision of responsibility. That is, disclosing the solution concedes liability. You have to wonder, what would Steve Jobs do?
jmf
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Dec 10, 2013 7:23 AMby Daniela Sciaky,I have been searching for posts like these and find all these results quite interesting. I have similar video and freezing problems on a late 2006 iMac (2.16 GHz Intel Core 2 Duo) running OS 10.6.8.
It looks like the video doesn't refresh fast enough such as when minimizing a window, remnants of the window remain on the screen. My dock also occasionally goes bonkers, pixelating all the icons. And when scrolling through a document that's on the web, parts of the document disappear and reappear either at the same place or on top of other parts of the document. Facebook sometimes gets very interesting.
The only thing I haven't done is remove Chrome. However a MacBook from 2007 and running similar software works fine with Chrome.
So I'm not convinced its a software issue. TekServe and Apple all think its the video card. Since I have relatively old equipment I guess its time to buy a new computer. Sigh.
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Dec 10, 2013 3:32 PMby GeorgefromPVNY,Also was having the same issues withe the squares and the freezes. I have a 21.5 mid-2011 with 8gb running Mavericks.
Forgive me if this "solution" has already been discussed, but I made a couple of changes to my Energy Saver preferences for an unrelated issue involving iTunes, and it seem to have fixed the graphics problem. In Energy Saver I unchecked "Put hard disks to sleep when possible" and then changed "Computer sleep" to never. Did this 5 days ago and not only did it fix my iTunes issue it seem to have fixed the graphics issue. Who knows.
