I have a late 2009 iMac w/2.8 GHz Intel Core 2 Duo, 6GB SDRAM, OS X 10.9. On a fairly frequent basis it will go to a white screen, a black screen or something like blue and white stripes and there's absolutely nothing I can do other than do a hard shutdown by pressing the power button. I only recently upgraded the SDRAM and went to Mavericks when it was made available however this problem has existed for quite some time. I've run every diagnostic I know to run and it has found absolutely nothing wrong. The usual software running is Mail, Safari, Pages and of course Accordance (10.3.2). I would appreciate any suggestions for isolating the cause of this issue. As you can imagine when it happens it's quite frustrating...
Intermittent Freezes - Need Suggestions
Posted 19 November 2013 - 07:54 PM
OS X El Capitan 10.11.4 - iMac Early 2008
iOS 9.3 - iPhone and iPad - Current iAccord Release
Posted 20 November 2013 - 11:00 AM
No great answers I'm afraid. This sounds like one for the guys at Apple. You might try ifixit and see if they have any posts on anything similar. My first thought is that it sounds like a hardware but it could be almost anything. I use non-Apple aftermarket memory in my Mac - about the same vintage as yours. I don't know if you have any non-Apple parts. Could be bios. The box isn't getting excessively hot or anything is it ? If you're into it simply pulling it apart and giving it a good look over and a vacuum out might be enlightening.
If you can recall anything about what happened about the time the symptoms first appeared that might help.
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Accordance Configurations :
Mac : 2009 27" iMac Windows : HP 4540s laptop
Intel Core Duo Intel i5 Ivy Bridge
12GB RAM 8GB RAM
Accordance 11.2.4 and 12 Accordance 11.1.6 and 12
OSX 10.11 (Yosemite) Win 10 Professional x64
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