Sleep/Wake issue with 5K Retina

I know its a pain but get a replacement.

I got my 27 inch 4ghz i7 on Thursday last. I'm just reinstalling the OSX using recovery. I would feel the same about it as you. Have you tried a reinstall of the OSX. I understand it's a couple of hour job and if your still well within your return days worth trying. To Apple its a unit, but to you a large investment. I am sure Apple would not want you to be unhappy with it. I have always found that a reinstall of the OSX is generally necessary within a few days anyway. I think my issue was caused by a failed migration from my other iMac.

Tth option R recovery does not delete your other data, just reinstalls the operating system. I did this with Apple last week with my older system it was very painless.

I am sure you know this. Turn the iMac off. Hold down option and r when you power on. Hold until Apple logo appears! then release.You will then get 4 or 5 options ( sorry late at night in UK)

Select reinstall operating system and then wait. Depending on your broadband speed it could take a while. For me it's 4 hours but I have a very slow broadband at moment, awaiting Fibre optic. I suspect yours will be faster.

Go for the replacement.

Glad the issue has been sorted for you. I sorted my IMac out by reinstalling OSX.

I got my iMac Retina also beginning of December. I'm experiencing exactly the same issues.

What I have to point out is that I migrated the system, settings and data from my old iMac (2011) which worked flawlessly (lately). Therefore I don't thinkt that it's particularly a problem of the system.

As quite a few people on the net (also at macrumors Forum) are experiencing these issues I also don't think that it's an issue that would be resolved by replacing the machine.

I remember well when my iMac 2011 was new that I've had some serious problems with sleep/wake too; that machine wouldn't freeze and reboot back then but it wouldn't sleep and constantly wake up from sleep. The issue disappeared after some OS updates back then...

I'm quite confident that we're looking onto some driver and/or app problems that surface on the combination of Yosemite and the new 5k iMac. Over all Yosemite seems to be having plenty of bugs on newer macs from what I read on Twitter and so on. Graphics performance of the OS UI isquite poor (not in terms of fps but generally) and it'd bet that Apple rather soon will let us have some OS & Firmware upgrade to resolve some issues.

However, I'm also going tof file a complaint just to have it in Apples systems that some things just aren't right....

Yeah, both, warning messages schouldn't happen at all on a new system and/or machine - BUT: what concernes me even more is the fact that BEFORE the reboot/crash happens the system cycles through quite a few sleep/wake steps, continuously spinning up/down the harddrive (I've got the machine with Fursiondrive) and that's not good for the drive at all. Plus: Each time iTunes was opened when the system crashed iTunes has to check it's database - and for my huge aperture library this won't be good either....

Well, it's not so much about where this info comes from, it's just how tings are with good old harddrives. Start/Stop cycles can (not must) wear down the drive faster than continuous operation. - of course this doesn't mean the drive will fail extremely quickly, it might work longer than you or I will own the iMac itself...

As with the databases I just don't want to put them on risk. iTunes is not that big of a problem as everything is stored in the cloud but with aperture I'm just concerned...

So while still having no solution I've tried several things to solve the problem though:

I've read in some forums that dropbox might have been an issue. Uninstalled it, problem persisted.

I've also unpluged each USB cable one after the other to see if any of the USB devices caused the Problem. No result. My iMac persistantly woke up from sleep even with no USB device connected at all.

Logs show the following on each occasion:

• Wake reasion: XHC1 (which apparently is USB)
• The USB device BRCM20702 Hub (Port 8 of Hub at 0x14000000) may have caused a wake by issuing a remote wakeup (3)
• The USB device Bluetooth USB Host Controller (Port 3 of Hub at 0x14800000) may have caused a wake by issuing a remote wakeup (3)

Systemprofile tells us that:

1. 0x14000000 i couldn't clearly identify but
2. 0x148000000 should be "BRCM20702 Hub

Conclusion:

As no EXTERNAL USB Device caused the iMac to wake up it must either be a driver failure or someting similar within the machine or some bluetooth device. The latter is less likely as it's the third of three wake reason provided by the console.

I do not have any wired keyboard or mouse so I can't verify wether Apples wireless Keyboard & Trackpad could be an issue.

I really do hope that the apple support is right (personally I also do think that it's not a hardware related issue)... it's just so annoying that we pay thousands of Euros (or Dollars) for then having a machine not working perfectly fine. Not very Apple like.

I have two Retina 5K's and both have intermittent Sleep/Wake issues.

Half the time it goes to sleep fine. In a few hours, if I am in the office, I see the screen saver is running. Upon keyboard input I see it is on the Login screen you get after a reboot. If I login I will see a report on screen about a graphics error on Sleep. So something caused the reboot. I have noticed some log info pointing to Google Chrome when this happens. Will experiment with quitting Chrome before sleeping to see if this helps.

The other half the time, the iMac will not wake from sleep. You need to hold power button for five seconds, wait for a few seconds, then power on and all is fine.

The logs are full of stuff but nothing that is understandable for the non-Apple hardware/software engineer except the Chrome stuff above.

The best luck I've had is shutdown if I will not be using the Mac for the rest of the day. A full reboot is quick since both are SSD equipped.

Neither of these Macs were setup with Migration Assistant or Time Machine restores. Only files from Documents and Pictures folders were copied to from the old Macs to hopefully minimize issues caused by migration or restoring. So I was on a clean install and so ti new install will probably not help me.

This is more of a nuisance and inconvenience at this point and hopefully Apple will get Yosemite fixed.