Il giorno 05/08/16 02.19, "Al Poulin" ha scritto: > My workhorse is the last 24 inch iMac that Apple produced. Running 10.9.5 > Mavericks. I have a similar iMac to yours, mine is just a 2,93 GHz. I usually run OSX 10.6, but I have and use 10.9 also. Never experienced issues like yours.
> When waking from sleep, occasionally the display will scramble for about 5 or > 10 seconds I'm sorry, I have no idea what you mean with "scramble"...? Maybe a picture could be useful to understand. Can you take a picture of the screen? > This seems to happen more when multiple > screens are left open, even as few as three. Do you mean screens or windows? > Or, it may go black for a few seconds and then settle down. With "settle down", do you mean going back to normal?s The "go black" make me think about hardware issues. Never seen before on this kind of Macs. Unless you have some strange kind of software loading while starting up. > This has been happening for two or three years, but seems to be more often > now. If had been happening for such a long time, it isn't likely it's hardware; hardware issues usually become worse within some months/days. Although it _could_ be some connection issue: maybe the video cable is not connecting perfectly. But in this case the issue would present itself again and again, not just after boot. > If this is hardware, should I eventualIy expect total failure of the screen to > display properly and prevent access to the system? If it's the video hardware, yes, it's going to die sooner or later. One test you can do to check if it's the iMac video: if you have another Mac handy, connect them thru a Firewire cable, and boot the iMac in Target disk mode: https://en.wikipedia.org/wiki/Target_Disk_Mode The you can work on the iMac disk (even boot I think), controlling it from the other Mac, and check if the issue happens that way, too: - if it's software, it will happen (because you will be using the iMac software) - if it's hardware it should not. HTH, Valter -- You received this message because you are a member of the iMac Group, a group for those using Apple iMacs and eMacs. The list FAQ is at http://lowendmac.com/imac/list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to imaclist@googlegroups.com To leave this group, send email to imaclist+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/imaclist --- You received this message because you are subscribed to the Google Groups "iMac Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to imaclist+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
