Q: Mac Mini 2014 Oct cannot wake up after sleep

I'm having a variation of this problem.  I have a 2014 i7 Mini (internal SSD drive only, no other internal hard drive), connected via Display Port to a Dell 27-inch Ultrasharp monitor.  There is also a USB connection from the monitor to an external USB hub, which is connected to the Mini.  My keyboard is connected via USB to the monitor.  Two external hard drives are connected to the Mini (not the hub) via USB.  I experience the following:

• If I put the Mini to sleep, it will not wake without a "hard" reboot (long press of the power button)
• If I manually shut off the monitor (with the Mini running), the Mini sleeps and won't wake without a "hard" reboot

I have my Energy preferences set so that the display never sleeps, hard drives are never put to sleep, and Smart Sleep is off.  Very frustrating.

Hello

I have the same problem.

New Mac mini 2014 connected to my samsung tv via HDMI. If the screen turn off and my tv is turn off (or go to sleep) i can't see the mac mini when i put back on my tv. the mac mini work because I heard it (it's connected to a onkyo sound système )but no image. I have to disconect the hdmi cable ON THE mac mini (if I do it on the tv nothing happened) and the image came back.

However, I have no problème if the mac mini goes to sleep mode (when the front led blinking), It's just the "turn screen off" option and when my tv goes off that I have this bug.

I hope apple fix this quickly ! I miss the old panel with the two sliders

MAKE SURE YOU HAVE UPDATED YOSEMITE TO THE LATEST VERSION  .  .  .  OS X 10.10.1

Doing that cured my problem.

I realise that some people may not have the same trouble I had but ensuring you have the latest "bug-killing"  version of the operating system is a first step.

yes all updates done. And the macmini is just out of the box so there is just few thing in it.

I have this problem too.

Fresh new Mini late 2014 plugged in a VGA monitor through a Mini DisplayPort original Apple adapter. When i choose the "stop" option by myself, the computer stops and wakes up correctly.

When i leave the Mac alone for some minutes, it goes on stop. The white light on the device turns completely off and i cannot wake up the Mac in any way (mouse, keyboard, power button).

The only way to restore the Mac is to unplug the power cable and replug again.

I've done all the updates.

I Have this problem... Mac Mini (Late 2014) with HDMI (Samsung) monitor,with either wired or wireless keyboard & mouse..

The one thing which I found to wake it is to unplug the HDMI cable from the Mac Mini and plug it back in.

Hope this helps.

I am not happy to find yet another issue with an Apple product.  If I'm reading it correctly lots of problems are coming from Yosemite.  So if I understand the '

fixes' I can either disable safe sleep or try connecting to my monitor with an HDMI cable.  Changing anything through Terminal scares me as I'm not all that computer savvy.  And to think I thought my late 2011 MBP logic board was my only issue.........thanks for the good posts.

Shore, our fix absolutely worked for me.  I am always reluctant to mess around with Terminal but I decided after making a full backup I'd give it a go.  No more Problems.  Thanks!

Hello. I have a 2012 and have the same issue. But I can tell you that the Mac is not " sleeping". When I use splashtop to sign onto it it works fine but the monitor still will not display. I have to restart my Mini and then it works fine. Any help would be appreciated!

I believe that this is the "darksleeps" fall, that can be confirmed by "peseta -g" in terminal

If there is a "1" after it, it is on.

This basically means that the mac wakes up, but does not simply anything.

Switching this off, should help.

But I'd google it a little more if I were you

yay! thanks a lot, it did the trick for me

Thanks a lot at Shores403, i think it is solved because of your tip.

My mac mini 2014 2.6 i5 monitor would not wake from safe sleep using a Samsung Syncmaster 2233 with an Apple DVI to HDMI adapter attached to the monitor and an HDMI cable to the mac HDMI port. Tried everything except the changing sleep to 24 hours fix listed here, and would have to hold the mac's power button for a few seconds until the screen went blank, then pressing it again and everything would work. Finally hooked an old VGA to mini-display adapter which I plugged into one of the mini's Thunderbolt ports and now the monitor wakes like it is supposed to. The only thing I have noticed is the user icons have messed up colors, but once I enter my password and hit return, it all clears up just before the screen comes on.

Now if I can only get Mail to show my messages contents every time I open it instead of just sometimes, I will be happy.

The only thing I know that works, is to change the sleep mode. You may or may not get more battery drain during sleep. Use at your own risk!!

1. Open terminal and enter this command:

sudo pmset -a hibernatemode 0

2. Now enter your password when promted.

3. Enter sleep/close the lid, depending on what mac you have.

Hope this works for you:-)

If you want to reset it to normal mode again, change 0 to 3.

After sitting in sleep mode my Thunderbolt monitor wont wake up. Nothing and I mean nothing I try seems to bring it back to life. I have a micro business, and Im dead without this thing.  I just cant lose man days and manweeks with these stupid issues. Im am ready to go back to PC. Ive read threads about downloading updates and firmware updates, etc, etc.  How do I do that with a montor that wont turn on? Any ideas to just get this thing going....Please Help!!

Mac mini (Late 2012), OS X Yosemite (10.10.5), Wont wake monitor