Q: sleep wake problem with Yosemite on my Mac Mini Mid 2012

I haven't seen this problem on my install, but the symptoms being described here are classic power management problems.

The usual first-aid for this kind of problem is to reset BOTH the NVRAM (PRAM) and the SMC. I've seen people in this thread mentioning they tried resetting NVRAM(PRAM), but I haven't seen anyone saying they tried resetting SMC. The instructions for both are linked in the quote below from Apple's official support documentation for this problem:

If the steps above do not resolve your sleep-related issue, try these additional recommendations.

Reset SMC

The System Management Controller (SMC) is involved in managing power on your computer. Reset the SMC on your Mac if you are having difficulty sleeping or waking your computer.

Reset NVRAM/PRAM

Nonvolatile RAM (NVRAM)/Parameter RAM (PRAM) stores some power-related settings.Try resetting NVRAM/PRAM if you are having difficulty sleeping or waking your computer.

Test with external devices disconnected

Some external devices can prevent your computer from sleeping. Try disconnecting items other than your Apple keyboard or mouse from the built-in USB, Thunderbolt and Firewire ports on your Mac. If this resolves the issue, try reconnecting your external devices one at a time until you find the device preventing sleep or wake. Check the documentation that came with the device, or contact the device manufacturer for more information.

Try Safe Mode

Check to see if the issue still occurs when the computer is started in Safe Mode. If this resolves the issue, it could be related to a third party software item such as:

• a login item
• a startup item
• a third party kernel extension

Try another user account

Try creating another user account, or log in as guest. See if your computer sleeps and wakes properly from the additional user account. If it does, your issue may be related to one of the following:

• a login item
• an app open in the original user account

You can disable login items from the Accounts pane of System Preferences. Try opening only one app at a time in the original user account to determine which app is preventing sleep. If you isolate the issue to a particular app or login item, check its documentation, or contact the developer of that software for more information.

I'd avoid doing any of that PRAM/SMC stuff. Last time I did that myself, acting on the advice of someone in here, it not only did not fix the problem, it messed up whole bunch of settings I had to do all over again. This took a lot of time and was no fun. I see people in here all the time recommending that you reset your PRAM even for small and relatively unimportant problems. I would never advise somebody to do that unless the situation is absolutely desperate.

Anyway this problem with the computer not waking from sleep is not a deal breaker. We can live with it. There's no need to go messing up your entire system in what would probably be a vain attempt to fix it.

Resetting the NVRAM(PRAM) and SMC don't "mess up your computer", they restore those settings to defaults, just as they were when you first bought the machine and switched it on.

Any preferences you have that are not the default ones can easily be set using the System Preferences app.

Phil, I had done both two days ago, PRAM and SMC reset (and had posted it here or in the other sleep wake thread). Didn't help.

It's clearly related to the audio line plug and when a cable is plugged in, all other variations (i.e. HDMI audio, bluetooth audio) do work with sleep wake.

OK, thanks for confirming that.

Sorry you're still suffering!

I am having the same issue with a Mac Mini 2012 connected to a thunderbolt display and an HDMI display.  When i disconnect the HDMI display i don't have the problem as often, but still there.  The other issue i have is Wake on LAN when connecting with Back to My Mac.  Doesn't seem to wake up the Mac Mini when trying to access it remotely.

Updating my original post.  I have 1 display connected via thunderbolt to DVI, and regularly leave my headphones plugged in overnight.  There's no audio output to my monitor (doesn't support audio), but I'm wondering with all the comments in the thread if my connected headphones are the issue.  I don't understand how that could be, but I'll keep them unplugged tonight to see.  I also remote in to my mini from home regularly and since upgrading, I haven't even been able to do that.  I've tried even just an hour after leaving work and I can't SSH in.  That part really doesn't make sense to me, since as I stated in my original post, I set my screensaver (auto locks the comp) while going to meetings and am away for 1-2 hours at a time with no issue returning to the computer. 

Moral of the story still stands: Don't update your work machine to .0 versions of software.  I like to learn the hard way!

Mac mini (Mid 2011)

2.3 GHz Intel Core i5

8 GB 1067 MHz DDR3

Intel HD Graphics 3000 512 MB

Thank you, Vic. Great to hear you got a response. Crossing fingers for a fix soon.

I've been shutting down my system at night now, so I've got a least one less force shut down a day.

The other thing I haven't mentioned yet, is that I seem to notice (I say that because I'd have to keep an eye on it be 100% sure) that when I can log in after some sleep, that my login background is some generic brushed grey linen; and that when I can't log in, after long sleep, that my background is a silly vague / hazy 256 color rendering of my actual desktop background. 

I'm having the exact same wake sleep problem with a macbook pro retina 13" docked to a elgato thunderbolt dock.  Based on someone suggesting removing the speaker connector I noticed I had a microphone line in and line out to speakers in dock, so I removed the microphone line in and I can now safely wake from sleep without my keyboard/mouse.  

My other issues with Yosemite are having to restart the audio system when docking/undocking and opening my computer. I'm also having lots of audio problems in a Corona SDK simulator I'm using to make mobile games. 

All these issues seem audio related and I'm really tempted to switch back to Mavericks but I dont' have time machine backup so I'm hoping a fix will come out soon as I'd rather not have to start fresh again.

Add one more person with same problem after installing yosemite on a mac mini. No similar problems with my install on a macbook pro and a mac air.

sleep wake failure

I've been experiencing this issue with my late 2012 Mac Mini server. I can confirm that the issue is not caused by sleep/wake. If I disable display sleep, computer sleep and screen saver it will still occur. I can manually sleep and wake my machine without any issue. If I disconnect all I/O (Ethernet, FireWire, HDMI, Thunderbolt, USB, SD Slot & Audio) devices it will still occur. The machine will become unresponsive while simply idling on the desktop with only the Power port in use.

I have this exact same problem with my Mac Mini 2012 (bought a week ago 2.6 GHz Intel Core i7 16 GB / 256 SSD) After waking from sleep, the screen remains frozen. I can move the mouse around, but cannot click on anything. After all possible experiments without effect - returned to 10.9.5. I volunteered to support and sent the logs.

I have the same problem. I had to turn off time machine and my Adobe Creative Suite is very unstable and the programs crash repeatedly when opened on Yosmetie. I never had these problems with Mavericks or earlier.

I'm kind of a Mac idiot. I read you can migrate back to Mavericks. Can somebody tell me how I would do that?

Thanks