My computer has become slow to fully boot since updating to 10.11. This isn't helped by Applications (including their previous windows) reopening automatically post login. I am aware that this is part of the default Mac OS experience and I've seen answers that involve checking a box when restarting, although I would prefer a permanent fix to disable this particular function and any other advice to improve my iMacs startup efficiency.
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Is there any way to temporarily disable applications from starting up at login? I'm referring to both Lion apps that are started due to the resume/reopen feature, and also to applications set to launch in the Login Items setting.  I know that I can disable the apps from launching in Lion by unchecking the relevant checkbox right before I shut down, but what if I forget to do this, or if I decide I don't want them to start up right before I login?  To clarify: I'm looking for a one-time, temporary solution rather than something that will disable them all the time.
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This dreaded issue started at some time after upgrade to OS X (Yosemite) 10.10.3. accountsd uses about 60% CPU constantly, making the laptop hot and noisy.  I'm not using iCloud at all.  Killing it doesn't help, because it starts again quickly.  Probably related question, but it's about iOS:
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I've got a Late-2011 15" MacBook Pro stuck in the gray screen when booting AFTER login. I've tried removing the drive (it's non-retina) and booting from a working bootable Yosemite installer, no luck. (it sees the startup USB drive, the progress bar progresses, but stuck at the gray screen again even without a drive.  Tried NVRAM reset (cmd option P R), it has reset (the login sound's volume changed) but nothing changed.  Tried holding D on startup, AHT doesn't start, instead, it tries to boot into the OS.  Tried Cmd V, it sometimes works and displays the verbose output, sometimes, it acts like I haven't even pressed. Again, stuck after login.  Tried booting again from USB, I select USB (after seeing both drives correctly), but no luck, it's also stuck.  I've stumbled upon this:    I've tried booting into single user mode with Cmd S, it worked ONCE, I've disabled the graphics extensions just as shown at that post, restarted, but again, nothing changed.  More weirdly, now the Cmd S doesn't work either. It just takes me to login screen without showing the terminal, just as I haven't pressed anything.  Why would this happen? Why would a Mac refuse to enter hardware test mode, single user mode, or refuse to boot from a working bootable Yosemite drive both with or without the main drive installed?  UPDATE: I've run the AHT and got an error:  4MEM/66/40000000: 0x84e0ec98  It looks like a memory issue, but I'm not sure.   UPDATE 2: I've tried reinserting the RAMs and the the problem is not reported anymore. However, the Mac still won't boot.
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I have this strange problem of my Mac rebooting. Everything was normal until I started syncing photos from iCloud (this could be coincidental, maybe not). First time I noticed a problem after 1-2 days as my system fan started going crazy, with CPU utilization at a max, several minutes later followed by system shut down. I traced the 100% CPU to Spotlight reindexing constantly; I temporarily disabled indexing:  sudo mdutil -a -i off   Problems with fans went away, but now photos service was going at very high CPU, accelerating fans again. I disabled Photos app (as much as I knew how) to avoid performing any analysis. This solved the fans and CPU going crazy problem. I could live without Photos on this Mac, no problems here.  Photos/Spotlight searching might just be coincidental, this part I'm not sure. Just so my system was more or less stable for at least several month before this addition.  But, here's the problem:  As soon as I leave my computer alone, after several minutes of inactivity, something happens that my computer goes into sudden reboot. I can't even leave it for 5 min for bathroom break. For information: putting computer to sleep was always disabled on my Mac, only screen saver and later on monitors were to trigger. Now I disabled it all, with no difference. I tried: 'caffeinate' with no difference as well.  Also, working on my Mac, performing various tasks has no effect whatsoever, but leaving it idle, goes to reboot soon.  Please help. What I was trying to find is if there's some kind of log that I could dump of a system on freeze, some entry to trace of what was the final activity before my Mac reboots. Any idea?
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Several responses to a question  suggested I try Opera kiosk mode, so I decided to download it and give it a try. Once the download had completed and the disk image was being verified, Safari hung for over a minute and there were periods where Safari used a very high %CPU:    In Mac OS X 10.5, I was accustomed to seeing Safari freeze, but it never used up more than 200% CPU (2 cores x 100%). Is this a bug in Activity Monitor? Or does this mean that %CPU is now more akin to ?
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After restarting my computer when I am presented with the initial login screen (the light gray one with the restart and shut down buttons), I see only two of my three user accounts.  If I log in with one of these accounts, I can see, and log in to, the third (missing) account by either:   Logging off (Apple > Log Out...) to reach the second login screen (the dark gray one with sleep/restart/shut down buttons) Clicking on the fast user switching menu.   How can I restore this account in the initial (light gray) login screen?  I tried repairing disk permissions to no avail.  If I create a new account, it does show up in the list.
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Every time I boot into OSX or Windows, Steam automatically starts.  Is there a way to stop Steam starting whenever I boot up my computer?
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Why is it sometimes that I need to restart my computer after installing new software and at other times I don't?  Is there any reason why it needs this reboot or why it's not always one way or the other?
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I am sure many of you guys know the flashing folder icon which shows up when the Mac cannot find a drive to boot from. My 2017 MacBook Pro has this issue for some time now, but recently I found something interesting.   The MBP won't find the boot drive, as long as the battery level is at > 70%.   The Mac boots just fine at lower battery levels; no issues whatsoever. Now, the problem is, I don't want to run my MacBook via battery the whole time or keep on disconnecting the AC power when 70% is reached every time.   Does anybody have similar symptoms and did find a better solution? Do you think there is a hardware issue with my device?   I've been to the Apple store before (when I didn't knew this was connected to the battery level) and they couldn't find anything. They suggested I reinstall macOS, which of cause didn't change anything.  Edit: One detail I forgot to mention was that when I charge my MBP and close the lid, it crashes and gets really hot (fans turn on slowly). I'm not totally sure on this, but I think this also happens with lower battery levels.  Battery Info:
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I installed 10.10 a few days ago. The only changes to the default install are the addition of Chrome and Pinta.  It was fine for a few days, then today login etc seemed slow. Likewise it couldn't even render the restart/shutdown menus.  Hoping it was some botched update, I ran the update manager; it tried to install but failed (the UI didn't make it obvious what had failed).  Fine, ok. Shut it down (press enter on the blank shut-down dialog).  Fire it up hoping... And... #fail.  Target filesystem doesn't have requested /sbin/init. No init found. Try passing init= bootarg.   Is it now a brick?     More details:  GRUB 1.98+20100804-5ubuntu3   With  Ubuntu, with Linux 2.6.35-22-generic   Causes  udevadm trigger is not permitted while udev is unxonfigured Giving up waiting for root device.   Or  Ubuntu, with Linux 2.6.35-23-generic   Causes  mount: mounting /dev on /root/dev failed: No such file or directory   Then the same for /sys and /process
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When I start my PC, it boots into Windows (Windows 7 32-bit) quite happily, I login and the main Windows screen appears. At that point, however, the system is extremely unresponsive for up to 5 minutes - if I click on Firefox to start it, nothing appears to happen for a long time, etc, etc. The mouse and Windows UI is responsive, but programs take forever to start, webpages seem to hang (or at least load extremely slowly) and so on.  I imagine that the issue is with one or more programs that run on startup, but I don't know quite how to identify which one it might be. The event log shows nothing of any obvious interest. I can't see any high CPU activity in task manager or Process Explorer, and I can't hear any high disk activity.  I'd rather understand what's happening and then work out how to address it, than have to go for a blind "switch things off and see what helps" approach, but maybe that's being optimistic :-)  I suspect disk bottlenecks or network, but I don't know how I could set something up to diagnose this (and in particular, given that I can't get programs to start in a timely manner, I'd prefer something that automatically starts and logs data for later analysis than something like Process Explorer, which always leaves me worrying that by the time it started the problem had gone away :-)  I guess my ideal would be 2 things:   Something that gave me an overall "what are the current key bottlenecks in this system" summary (ideally, which could be set to run in the background and collect data for later analysis). Some means of starting a program (say, Firefox) and have it record what was going on in terms of waits and delays in the system.   Unfortunately, I've never really found anything like either of these.  I'm not a professional systems admin - my background is database admin - so if there are "obvious" tools to look at or try, then I'd be grateful to know of them (particularly if the information they give is easy for an amateur to analyze) :-)
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When I want to shutdown my PC I click the top right corner and then press the power button after which a dialog pops up with the options: power off, restart, cancel.   Normally this pop up shows up right away. But since a week or so it takes about 30 seconds. During that time I can move my mouse but I can't open applications or do anything else.  When I cancel and try it again, it does open right away.   I didn't change settings or install weird stuff, only some updates of my icon theme. (I apparently had installed the ).  What could be the cause? And how can I diagnose this issue and see what it taking so long?
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I know there are Login Items under Users &amp; Groups and /Library/LaunchAgents and /Library/LaunchDaemons under Library, System/Library and Users/FooUser/Library. And then there's right click on Dock icon -> Options -> Open at Login.  What other methods are there for apps to auto-start? The reason why I'm asking is because the Spotify App (downloaded from ) keeps starting up whenever I restart my Mac, even though I made sure there is no corresponding entry in any of the above mentioned places.
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After update to OS X 10.11 I started having these bugs:   Finder sidebar text flashing  Very high CPU load:      I have Macbook Pro Retina 13" Mid 2014  I reset NVRAM.  I deleted com.apple.finder.plist, it didn't help.  Also I did this: , no longer flashes.
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When I installed the last Windows update, all seemed fine except it got stuck doing the restart.  I waited about 5 minutes then used the power button.  Startup was normal.    But then when I told it to shut down it closed the programs then went to the "Shutting Down" screen and just stays there.    Disk activity lights aren't showing any activity.  Here is a screen grab of the most recent updates:    Before I do anything I wanted some input.  Question:  Any ideas of how I can figure out how to fix it?
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Starting with windows 8 I have many many many hardware issues (that are not present in Windows 7). One of these issues is the fact that an initiated restart does not work. It shuts down, the bios shows up, loads, then the windows boot loader begins loading and suddenly the progress ring halts and nothing happens anymore (I have tested it for several hours). While this is not really a problem usually (If a service attempts to initiate a restart I just pull the power after saving everything) with windows 10 it became a problem. A while ago obviously a new build was released and it tried to install said build. This is done using an initiated restart. The restart happens, it hangs in the boot loader and when I reset the machine I get the usual "Your windows has been reverted to an earlier version" message. So far so good. The problem is that since then every day this happens. It randomly asks me if I want to apply the update now, I obviously dont want it to, and set it to remind me again in 8 hours. I dont know what insane person had the idea that a forced shutdown that kills every living thing on your computer was the appropriate action for something as utterly unimportant as an update but sadly after these 8 hours it does exactly that.   After loosing a several gb download and a very long compilation has been corrupted I'm now ready to do everything to stop this madness. I first tried it the nice way and checked the update settings. Windows responds witht he following:   A note here: I am the system administrator, this is a home computer and I am on the only account there is. How do I get rid of this non-sense?   Next I tried to forcefully kill the entire update service. It seems it worked for regular updates, but the preview build update is something that is not covered by that. When I go to the settings for new build installations all I am able to change is the time new builds should be installed (if available). Is there a way to completely disable that?  So to summarize: Is there a way to prevent windows from performing any action if there are updates? Or disable updates completely? Making everything manual? In the end the updates have destroyed more on my computer than they have prevented.
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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?