I have a 2016 MacBook Pro 15", running macOS Sierra, which fails to shutdown properly. Originally when I closed all applications and then went to shutdown, it would take less than 10 seconds to completely power down.  My problem:  Now, when shutting down, applications will close properly, the Desktop turns to a black screen (all normal so far) but then the display will not power down, as the backlight remains on. This lasts for anywhere from 9 minutes up to nearly 20.  What I have tried:   I have removed all login items from my user. I have done a boot into safe mode. I have reset the NVRAM (PRAM). I have live-chatted with Apple support and went through clearing the User and System Library/Cache directories.   Nothing seems to resolve the issue.  One point to note is that when I reach the login screen, and choose "Shut Down" instead of entering my user password, it will shut-down quickly. I suspect that an application is preventing the normal shutdown, but don't know how to go about finding it.  I have attempted to look through the console for errors but nothing seems to leap out at me.  Can someone please suggest a solution, or a means to identify what is causing this issue?  UPDATE: I am just performing the latest macOS 10.12 update to see if that helps at all.  SECOND UPDATE: After using live chat with an Apple engineer, we have narrowed it down to the Launch Agents / Daemons. We moved most of them to the trash, and I have tried to add a few back in (shutdown, reboot and then attempt a clean shutdown). It could be the MySQL agent. I don't have many others apart from Adobe / Creative Cloud, Google's Keystone and Oracle MySQL.  Not sure if I should add this as an answer?  Note: This is not a duplicate as my Mac didn't hang permanently, and the solutions in that question didn't help me in this case.
113936
Whenever I try to shutdown or reboot my Mac (Macbook Pro 15" Retina late 2013, OS X 10.11.3) it closes all programs like normal and then it goes into that black screen with the progress bar. When it gets to about halfway it permanently hangs and won't ever finish rebooting. I looked at the log viewer and couldn't find anything in particular. Is there a way to monitor a shutdown more closely and find out what's causing it to get stuck?
39136
MacBook Pro (15-inch, 2016) with 2 USB-C to HDMI adapters. The setup works great if I start up in that configuration.   If I connect the adapters while the machine is running or simply sleeping, one of the monitors will never get a signal and stay in low power mode. The OS sees the monitor, it shows in the display arrangement settings and I can move the mouse into it, but until I restart, I can't see anything on it.  Once I have restarted I can let the machine sleep or whatever, and the display still works unless I disconnect the adapter. As soon as I do that a restart is required to use it again.   Using MacOS Sierra (10.12.4)  Using this adapter:
92864
macOS Sierra is a whopping 4GB+ download and on my capped bandwidth ISP connection I've wasted already 10GB just trying to download it. App Store always restarts download instead of resuming from how much it had already downloaded. I frequently get logged out (am guessing its because of heating issues) so the download is interrupted.  Am running OS X 10.10 on Macbook Air mid-2011 11" model.   Any help to fix this?  Update Here's the output of syslog | grep -i "shutdown cause"  Oct  5 15:24:17 leh kernel[0] &lt;Notice&gt;: Previous shutdown cause: 3 Oct  5 17:05:43 leh kernel[0] &lt;Notice&gt;: Previous shutdown cause: 3 Oct  5 17:53:43 leh kernel[0] &lt;Notice&gt;: Previous shutdown cause: 3 Oct  6 18:06:44 leh kernel[0] &lt;Notice&gt;: Previous shutdown cause: 3 Oct  6 23:32:49 leh kernel[0] &lt;Notice&gt;: Previous shutdown cause: 3 Oct  6 23:35:42 leh kernel[0] &lt;Notice&gt;: Previous shutdown cause: 3 Oct  7 23:18:26 localhost kernel[0] &lt;Notice&gt;: Previous shutdown cause: 3 Oct  8 11:46:24 leh kernel[0] &lt;Notice&gt;: Previous shutdown cause: 3 Oct  8 11:52:36 leh kernel[0] &lt;Notice&gt;: Previous shutdown cause: 3   From googling the shutdown code, I  that 3 stands for a dirty shutdown. How do I investigate which app is causing a dirty shutdown?
88294
I did an update on my Macbook Retina 13" to the most recent version of Sierra OS X. The computer never gets past the Apple logo (black screen with a full progress bar).   I booted into Verbose Mode (command + v) and see that it is stuck at the following point:  SmartBattery: finished polling type 4  Every now and then it will add another line of text (same text) but it never moves beyond that point.  Any advice please! It is a real pain to keep restoring from my Time Machine backup!
99052
I have found contradictory opinions on this. Some say Windows users tend to shut down but that it is not necessary, and I tend to do that too. Others say it is preferable to shut down, as it does not take too much time to boot anyway, and that in this way the battery is protected. While others say that it is in fact better not to shut down to often, including for the battery, etc. An interesting opinion - cannot find the link for that now - was that shutting down / restarting serves no purpose for Macs, except when that is needed after installing or upgrading applications or the system, unlike in Windows, where shutting down was (is?) very important. Also, that Macs do periodical system maintenance work during operation and even sleep, which eliminates the need for restart; possibly restarting would even come against all this, etc., and &quot;not shutting down&quot; is in fact a typical differentiating Mac feature. Is this true? I need a competent opinion on this - not just a description of the most common use - preferably reflecting some advice from the manufacturer. I have a Macbook Air.   Update after answer: Although I got , a crucial point in it (that the system has to be shut down, but only from time to time) is not yet clear: how often should I shut down the system. So, I will bring my question down to this formula. As pointed out by that answer, my question cannot be answered in relation to a tangible benefit for the system, but rather in relation to the battery life. So, I guess this last point can be answered by some information on how how is battery life dependent on how often the system is shut down.
112860
What is it that Windows is doing when it shuts down?  Assuming I've saved everything, what negative impact does powering down instead of shutting down properly have?  We've all done it at some point and personally I don't know anyone whose machine has died as a result.  (Just to be clear, I know I shouldn't, I'm just not sure why.)
54527
When I close my MacBook Pro in the evening, and then open it in the morning, the display is illuminated and the apple is bright but nothing is happening. So I need to push the power button to restart it. When it restarts, Google Chrome crashes and virtualenv is logged out.   I thought that the problem is with hibernation so I set the hibernation to 0 in pmset. My current pmset parameters are as follows:   standbydelay         10800  standby              1  womp                 1  halfdim              1  hibernatefile        /var/vm/sleepimage  powernap             1  gpuswitch            2  networkoversleep     0  disksleep            10  sleep                1  autopoweroffdelay    86400  hibernatemode        0  autopoweroff         1  ttyskeepawake        1  displaysleep         10  acwake               0  lidwake              1    2018-10-05 12:50:03 -0700 Assertion status system-wide: BackgroundTask 0 ApplePushServiceTask 0 UserIsActive 1   PreventUserIdleDisplaySleep 0 PreventSystemSleep 0 ExternalMedia 0 PreventUserIdleSystemSleep 0 NetworkClientActive 0   Listed by owning process: pid 94(hidd): [0x0000000e00098030] 00:00:00   UserIsActive named:"com.apple.iohideventsystem.queue.tickle.4294968174.3" Timeout will fire in 600 secs Action=TimeoutActionRelease pid 188(mds_stores): [0x00000115000b80fd] 00:00:00   BackgroundTask named: "com.apple.metadata.mds_stores.power"   Kernel Assertions: 0x100=MAGICWAKE id=503 level=255 0x100=MAGICWAKE mod=31.12.1969, 16:00 description=en0 owner=en0   Idle sleep preventers: IODisplayWrangler   If I close the lid shortly everything is okay. Any ideas on what is going on?
22393
Sadly, yesterday I've spilled some water on my MacBook Pro (El Capitan). Before you yell at me - it was closed, turned off and it wasn't a lot of water, the laptop was wet only on the top and under - not inside.  Today I've turned him on. At first battery wasn't recharging for some reason, but SMC reset fixed the problem.  At the first booting speaker was like talking to me, hard to explain but it was weird. Also only right speaker was "talking", despite the fact that only left side of the laptop was watered. Then there was no sound at all, not from the speakers, nor from the headphones. Also microphone's not working. USB ports are okay. The water was spilled from the left side of the laptop. I know this is hardware issue, and something's broken, but I want to be 100% sure. No it's not muted. I've also tried NVRAM reset a few times, but it doesn't fix the problem :(  There might be one factor, before spilling, my laptop "died" for the first time (battery energy ran off), but I doubt it's the case. (but hey, every info matters, right?)  It wouldn't be weird for me, if only left speaker wouldn't work, but built-in microphone not working is kinda weird in this case, isn't it?  I just want to ask you guys, what else can I check, before I'll be 100% sure it's dead inside?  I've plugged in external microphone - it's not working too.
71056
I have a mid 2009 MBP which was heating up way to fast because of the fan; then I bought a new one and changed it. I also applied a new thermal grease. Plugged all the cables, tightened all the screws, reset SMC, reset NVRAM and turned on.  The heat is gone and its running perfectly now, but:   the display started showing some "blurry ghosts" at the bottom of the screen which won't show if I take a screenshot, so I took a photo that you can see below.      the keyboard backlight isn't turning on. I tried to unplug and plug the cable over and over again, but nothing happened. the camera isn't working at all. All I see is a black screen.    Is there anything I can do to fix any of these issues?
47156
This is on an Early 2011 Macbook Pro 17" with i7 2.2ghz and the Intel + Radeon HD6750:     If it is a screen error then I don't mind fixing it myself, but if the GPU is the problem, I'm worried I might have to buy a new logic board assuming I can't use the GPU.
79974
I recently upgraded from Ubuntu 11.10 to 12.04. If it makes any difference, my system is a Dell Inspiron 1520.   I encounter a problem whenever I shutdown or restart; it kills all running processes (as far as I can tell), but once I get past the shutdown text screen and the screen goes black,  my computer doesn't power off. The fans still run and the screen is still on, etc. I have to hold down the power button in order to complety shut down.   Does anyone know how to resolve this problem?
110925
I have lately been experiencing this problem on my Mac book pro 13" mid 2010 where it usually hangs and doesn't  resume normal working. I try to restart the computer but it gets stuck at the progress bar. I have tried everything from safe mode boot, PRAM reset, disk utility first aid in recovery and time machine restoration but the problem persists until I reinstall OSX (it worked the last time at least). Now it has hit again. Need suggestions on how to deal with it. I'm using Mac OS X El Capitan and it gets stuck at approximately the 90% mark.
101902
My 13" MacBook (late 2006) is set to never sleep but after about 3 hours the whole computer still goes to sleep.   Lid is always UP. Power Adapter is plugged in and indicator light is green when battery is 100%. Recently upgraded to Mac OS 10.6.8 and all system software is up to date.   Here are my exact settings...  System Settings -> Energy Saver ->   Computer Sleep: Never Display Sleep: 15 minutes Put the hard disks to sleep when possible:  NOT checked Wake for Ethernet:  NOT checked Automatically reduce brightness before display sleep: checked Startup automatically after power failure:  NOT checked    (please ignore the "battery charge: 94%", it's only because I'm composing this question while using the battery)  I recently installed Simon for monitoring uptime of websites.  I cannot allow the computer to sleep since it stops the software monitor.  Exactly after three hours of inactivity, the MacBook goes to sleep so then Simon stops.  The console confirms sleep mode.  I can wake it without a problem but it's frustrating to see that my monitoring was interrupted for many hours by this sleep bug.  It's like it thinks it's set to sleep after 3 hours despite it being clearly set to "never".  So where is this thing stuck?  Is there some cache or plist file I need to blow out?  Troubleshooting this is very difficult since I essentially have to wait another three hours to see if I fixed it.  Any shove in the right direction appreciated.    As per comments, this is the result of pmset -g from Terminal:  MacBook:~ myusername$ pmset -g Active Profiles: Battery Power       1 AC Power        -1* Currently in use:  lidwake    1  autorestart    0  halfdim    1  sms        1  hibernatefile  /var/vm/sleepimage  disksleep  0  sleep      0  hibernatemode  3  ttyskeepawake  1  displaysleep   15  acwake     0  womp       0
73356
I just reinstalled high Sierra after my Mac wouldn't restart. The moment it loads up I am presented with this screen. My login credentials don't work. Can someone explain to me what this screen is and what I'm supposed to input?
15364
Platform: OS X: Yosemite 10.10.4; MacbookPro 15" Retina (mid-2015). Fact: There is aging for battery in any case - using or not. But while using - there is difference of how to use. My questions - in order to minimize battery degradation:    How often should I totally discharge battery ? Is degradation rate is a matter of full cycles or it doesn't matter to what highest and lowest level I charge or discharge laptop ? Most (99%) of the time I am connected to power - which leads to 100% charge level always. But many sites say, like following link:  say, that better to keep battery 40% charged than 100%. How to achieve that (there is no ability, as far as I know, to manually limit charging battery level) ? Do you have empirical evidences to prove or disapprove this expectations ? I ask this since to replace battery in Macbook Pro is hard to be done - many screw types, many modules do disassembly, using glue to grasp components without moving inside. And therefore I prefer doing this rarest I can. How much time (how many years) it typically takes upon your experience to get to buttery degradation of 40% capacity compared to Day-1 of using your Macbook Pro ? After 2 minutes of laptop using - the internal temperature (CPU, RAM, Battery) gets to 85-90 degrees (Celsius) and stays so till I turn off (sleep) laptop - for 12 working hours every day. Is there something I can do about heat (both in general, and regarding battery especially)?   What else should I do or know to not be frustrated later ?
75285
So after working on my Macbook for a while. Menus will start blanking out.     Right click on Chrome in dock:    Top menu bar totally blank:    Right click on desktop:     Clicking the black Apple icon in the top left corner of menu bar:    Any idea what's causing it? I have to reboot or log out each time, which is no easy task given menus are blank.
112577
When your entire macOS freezes up and restarts, are there crash logs or core dumps to diagnose the problem? I would in particular like to know which kernel module was active at the time of the crash.  Symptoms: The display "froze", the mouse cursor stopped moving, and the Force Touch trackpad stopped doing clicks. After maybe 10-20 seconds, the system restarted on its own. When it came back up I expected to see a Crash Reporter dialog, which usually has some useful details on the crash, but there was none. I also looked through logs in the Console and couldn't find anything, though maybe I missed something. Is there some place where I should expect to find crash logs?