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Switcher Hangout (Windows to Mac)
Small Square Pixels Display Problem
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<blockquote data-quote="willgal" data-source="post: 1702664" data-attributes="member: 370276"><p>I have had the same problem for some time with a 27" iMac of slightly newer vintage. Your screen shot looks very much like mine. That pixellation appears at random - sometimes with intervals of several weeks with no problems in between. I haven't been able to find a pattern or cause. Everything (including the graphics card) tests out on the hardware check, but I finally took it in to an Apple Store Genius Bar. They ran several tests - including one that went overnight - and still found no failure in the hardware components. Their only conclusion was some sort of a software problem. They wiped the hard drive, and I reinstalled from my Time Machine. Everything worked fine for about 5-6 weeks - - then I started getting the same thing happening again. It has become more frequent of late - including this morning, which is why I was searching again and found your post. The only thing I've ever been able to attribute it to was switching desktops via Mission Control. Even with all programs and windows on a single desktop, it has still happened. The graphics card has never failed a test, though, and I didn't want to pay to replace it unless I was sure it was going to solve the problem. The other idiosyncratic item is that sometimes the pixellation will disappear after a restart, but sometimes it just remains - then goes away on its own. The only thing I've noticed consistently is that the little squares seem to blink when the internal drive is being accessed. That one really has me stumped.</p></blockquote><p></p>
[QUOTE="willgal, post: 1702664, member: 370276"] I have had the same problem for some time with a 27" iMac of slightly newer vintage. Your screen shot looks very much like mine. That pixellation appears at random - sometimes with intervals of several weeks with no problems in between. I haven't been able to find a pattern or cause. Everything (including the graphics card) tests out on the hardware check, but I finally took it in to an Apple Store Genius Bar. They ran several tests - including one that went overnight - and still found no failure in the hardware components. Their only conclusion was some sort of a software problem. They wiped the hard drive, and I reinstalled from my Time Machine. Everything worked fine for about 5-6 weeks - - then I started getting the same thing happening again. It has become more frequent of late - including this morning, which is why I was searching again and found your post. The only thing I've ever been able to attribute it to was switching desktops via Mission Control. Even with all programs and windows on a single desktop, it has still happened. The graphics card has never failed a test, though, and I didn't want to pay to replace it unless I was sure it was going to solve the problem. The other idiosyncratic item is that sometimes the pixellation will disappear after a restart, but sometimes it just remains - then goes away on its own. The only thing I've noticed consistently is that the little squares seem to blink when the internal drive is being accessed. That one really has me stumped. [/QUOTE]
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Switcher Hangout (Windows to Mac)
Small Square Pixels Display Problem
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