Sleep/Wake issue with 5K Retina

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My wife and I received two retina 27" iMacs last Monday. 32 GB ram, 4.0 I7 and 290 GPU, 1TB fusions. We had sleep wake issues with both computers.

Did a delete of the drives and re-installs of the operating system. Still had problems.

Changed the setting in System Preferences/Energy Saver "Prevent computer from sleeping automatically when the display is off" from being unchecked, to being checked. They have both been flawless since making this change. We have loaded Parallels and all of our other software on, and no problems.

We had talked with 5 very polite Apple Customer Care personnel before discovering this setting on our own. So glad we didn't have send back the Retina's! Love the displays! Hope this works for you!

I resolved my Sleep/Wake issues differently.

I perused the log and noticed that there were references to Google Chrome around the time of the failure. It was either the messenger or the cause. So to be sure what was happening, I Control-Q both Safari and Chrome before sleeping the iMac. Issues are 99% gone. Have only seen 1 Sleep/Wake error in past 6-8 weeks and 2 restarts during Sleep with no error screen on re-login so not sure what those were.

Have not used the checkbox you mention as I am not sure if that might shorten the life of the iMac leaving stuff awake all the time. I have all SSD drives but still not sure what else may be affected.

Interesting! Looks like there is more than one way to skin a Mac!

Before we tried the setting I referenced in my Jan 19 post, we made sure that no programs were active when leaving our computers on for the night, and still woke up to computers that had re-started, or needed to be re-started, so we opted for preventing the computers from sleeping when the display is off, which worked for us.

My previous machine was a 24" early 2009 iMac, so a six year old computer. That machine was set to never sleep ever since I bought it, as I had programs that communicated over the net 24/7. Still runs great, so at least in my experience, I don't believe that the life of the computer was shortened for my last Mac. Hopefully I'll have the same experience with our new 5K's.

My last machine didn't have the "prevent computer from sleeping" checkbox that this new 5K has, even after erasing the drive and re-installing 10.10.2. It had a slider bar to accomplish the same task. (Interestingly, I don't have any sleep/wake issues with my 24" iMac, even when it is set up to sleep in the Energy Saver preferences.) I'm assuming that there are firmware differences that the OS recognizes and then displays the appropriate energy saver options based on what the OS sees for a computer. So perhaps the sleep/wake issue is due to a firmware change that needs to be looked into.

Could you tell us how Trusteer Rapport got installed onto your system, and where it was located? i.e., did it come with the OS, or was it something that got installed with a piece of software that you installed post purchase?

The reason I ask is that when we first saw the sleep wake issues here, we erased our drives, re-installed Yosemite, and didn't install anything else to see if the problem was being caused by a piece of our software. We experienced the sleep/wake issues with nothing but Yosemite installed. Just wonder if Trusteer Rapport is "laying in the weeds" on the disc somewhere.

I just purchased a new 5K last week and added 16GB crucial RAM for the iMac. Ran the hardware test and extensive memtest and it appears to be fine. Mine sleeps everyday and last night when I got home I had the dreaded restarted from crash during sleep error.

Has anyone experienced this with a machine that you have 'not' added memory too? Some people on the Mac Rumors forums are pointing towards the Crucial RAM etc but I cannot imagine there being that much bad RAM not to mention it only happens when in sleep and not when using the machine. I wold think with bad ram the machine would crash at other times also?

I am hoping this is something that can be addressed with a FW update since it is only happening during sleep.

I know a resolution is to check "prevent computer from sleeping when display is off" but that runs the CPU fan etc all the time and will put more wear and tear on the machine and suck in more dust.

Im not going to bother exchanging the machine or reinstalling the OS since this is a fairly widespread issue. I did reset the PRAM and will see how it goes.

BTW I don't have any of the programs installed mentioned above so I think Apple is blowing smoke and that being the cause.

Thanks

I thought mine was doing better, but alas I get the Sleep restart several times a week all of a sudden after a period of weeks without one. Maybe it was update 10.10.2 or the fact I now use ethernet vs wifi for networking. I also don't want my fans and cpus to run continuously so I don't check the "Prevent computer from sleeping when the display is off" option.

I still love the iMac but Apple need tools at the dump reports mine sends every time. This happens less the the other 5K I have too.

@Richard

I'm having exactly the same thoughts. I've also upgraded from the shipped 8GB RAM to 32GB RAM, Kingston Original. But I also do not think that this is the issue. An Apple certified service provider hat checked the machine for any hardware issues and couldn't find ANY issue.

@jpsilver

same here! Had sleep wake failure 2 times March 2nd, once March 10th and three times March 15th. Now 4 days without any crash.

All the symptoms seem to be quite the same on our machines.

When did you guys get yours? Mine was delivered 11/2014. Maybe it's something that only a certain production run shows?

i have also sleep/wake issues with my 5k imac. i somehow have the feeling, that it all begun with 10.10.3 because in the i didnt have the problem earlier.

i put the imac to sleep manually each night and almost every morning i have to power cycle it, because it does not wake up anymore.

i checked the syslog and its shows that the imac does turn itself on during the night and then goes back to sleep. this might happen even a few times and then it freezes. i tried to unplug everything, but this didnt help.

in the log it shows me that facetime hd probably did cause the wakup, but this is an internal device and therefore i can not disconnect it. i will try now to close all apps too see if this is an issue - but then whats the point of sleep, when i have to close all apps first?

i also tried some settings in the energy saving dialog, but they didnt change anything.

I'm having the same problem on my new (less than 24 hours) iMac and it has the apple factory ram in it. That's not to say that the crucial memory isn't a factor, but i'm seeing the same problem on my end.

Here is how I have my iMac set up, and these settings eliminated the sleep/wake issues for me.

If you find another method that works, please post it!

Good luck.