The problem when your computer/device as a whole OR an individual application becomes unresponsive, "hanging" as it were, in mid air.

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10
votes
2answers
15k views

MacBook Pro with Mountain Lion freezes frequently (full screen Flash in Chrome, Messages, HTC on USB)

Problems following an upgrade to Mountain Lion on a 13-inch, Early 2011 MacBook Pro (MacBookPro8,1 with Intel HD Graphics 3000). With Google Chrome, I was watching YouTube video fullscreen – Flash ...
9
votes
4answers
30k views

Boot hangs on grey screen (even when booting from USB drive with fresh OS X install)

My MacBook Pro 15" Late 2011 (MacBookPro8,2) with AMD Radeon 6770M exhibited display corruption and associated system crashes/resets over a period of two weeks before it entirely failed to boot. The ...
5
votes
8answers
27k views

Checking for bad blocks without formatting

My Mac tends to pause every now then when preforming simple tasks such as right clicking, opening menus and typing (It actually just froze when I started typing this question.). I've read in a few ...
11
votes
2answers
13k views

How does 'stuck' (in results of 'top') relate to 'not responding' (in Activity Monitor), 'spin' or 'hang'?

In results of top commands, I sometimes see stuck. Apple's top(1) OS X Manual Page does not explain this use of the word. How, if it all, does stuck relate to the following? not responding – ...
4
votes
3answers
3k views

With Firefox Aurora, Mountain Lion hung - but the mouse still worked

I've just had my first Mountain Lion lockup. The screen was entirely frozen in place (I have seconds displayed on my clock in iStat Menu and even that wasn't moving) BUT the mouse still worked. I ...
8
votes
4answers
22k views

Finder slow/freeze under Mavericks

<rant>I wish I never upgraded to OS X 10.9, it is so buggy!! But the alternative to stick with the unpatched earlier version of OS X was not a solution! Anyway, so I am on this crappy Mavericks ...
2
votes
4answers
2k views

How to get my screen responding again?

My MacBook Pro is running, ssh works fine, but the screen does not respond anymore. The screen is frozen like the ice of Antarctica. The mouse does not move on the screen. The time of the clock does ...
11
votes
1answer
4k views

What does it mean when a %CPU exceeds (# of cores) x 100%?

Several responses to a question I asked earlier 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, ...
7
votes
2answers
464 views

My iPod Touch / iPhone is frozen!

My iDevice is frozen on one screen and won't let me do anything. What can I do to fix it?
1
vote
1answer
2k views

Mountain Lion Screen Freeze

My Mountain Lion is keeps freezing from few weeks, today it freezes/crashed couple of times already. Here is the log before the big freeze (file /var/log/system.log): SIMBL Enabler for Sandboxed ...
11
votes
3answers
30k views

How to stop MacBook Pro (Retina) from freezing/locking at the login/authentication dialogue, after wake?

Steps to reproduce: Be doing anything Close the lid of the computer Wait around for a while Open the lid of the computer Login prompt for last logged in user appears, battery and time MAY update, ...
8
votes
4answers
2k views

OS X Finder hangs on tagging

I'm having a problem with the new tagging feature in Mavericks and I have a feeling it might go deeper than just the tagging. The problem is this: When tagging anything on Mavericks the Finder ...
6
votes
3answers
2k views

Complete system hang, graphics-card related (“IntelAccelerator: bad busy count (255,1)”)

I have just upgraded my machine to Yosemite (as of three hours ago), and I have encountered my first hang (on this laptop, which is about a week old). The system locked up quite hard, with only the ...
3
votes
3answers
6k views

Built-In Trackpad and Keyboard Unresponsive after Sleep or Restart

I have a MacBook Pro (15-inch, Early 2008) that's currently running 10.7.3. I've been finding that it will intermittently freeze and then I have to shut down and restart the computer, but sometimes ...
2
votes
4answers
1k views

Mountain Lion sometimes hangs when mouse enters Dock – pointer is movable, but the MacBook Air seems otherwise frozen

I have a mid-2011 13" MacBook Air (MacBookAir4,2 with Intel HD Graphics 3000). Since installing Mountain Lion I sometimes encounter a problem when I move the mouse cursor over the dock to click ...
8
votes
3answers
3k views

How do I make Spotlight stop indexing my Backup drive?

I have a 2TB external drive I use for Time Machine. At random intervals, it will decide to spin up and my entire UI freezes until it's finished. This is incredibly annoying. It appears that this is ...
4
votes
10answers
5k views

What is wrong with my iMac? (video corruption, unstable)

I have a 24" Early 2009 iMac. During "intensive" use (such as Photoshop, WebGL, etc.), the system starts to become very unstable, resulting in bizarre graphics corruption and other weird behaviour. ...
3
votes
2answers
366 views

vm_compressor=VM_PAGER_DEFAULT in Yosemite caused freeze when physical memory was full

The memory compression caused frequently lag so I tried turning it off by using the command sudo nvram boot-args="vm_compressor=1" The lag was gone but I got crashing freeze when I opened some ...
2
votes
1answer
2k views

How to investigate high kernel task memory usage?

I was using my MBP (with 16GB of RAM) as usual and out of blue I've this popup that: Your system has run out of application memory. To avoid problems with your computer, quit any applications ...
18
votes
10answers
16k views

Why is Preview excessively slow after upgrading to Lion?

After upgrading to OS X Lion, I noticed that my preview app is now excessively slow, taking minutes to open a file instead of seconds, even when opening a local file. In addition, it is often ...
6
votes
2answers
17k views

Yosemite won't boot any more after attempting to enable FileVault and TRIM

I installed Yosemite yesterday and it was working fine. Now whenever it tries to boot it runs Safe Mode and fails 1/3 of the way through. From what I can remember I went to enable FileVault and ...
9
votes
2answers
31k views

Mac OS X Mavericks freezes, stops responding when running out of memory

It happens every other day and the symptoms are weird to say the least. The computer still responds in some sense; I can move the mouse, the volume buttons on my headphones work. They keyboard does ...
5
votes
1answer
2k views

How to kill stuck Screen sharing authentication dialogue?

Sometimes when connecting to a screen sharing machine in Finder, the authentication dialogue hangs indefinitely. The only way I've been able to get rid of it is log out. So far I've tried killing a ...
5
votes
3answers
1k views

Why does Safari always hang?

I use Safari as my browser, but I've found that it frequently hangs for 20, 30 seconds (sometimes longer), often times when I wake it up from sleep and/or when I open a new tab. Though I'm not sure ...
4
votes
1answer
2k views

13" Retina MacBook Pro completely freezes

Every once in a while, my 13" retina MacBook Pro completely freezes while I'm in the middle of working on something. And I do mean completely: it won't respond to any keyboard input, I can't even move ...
1
vote
0answers
2k views

Yosemite login freeze after sleep

I've seen several threads to this effect, but none that have resolved my issues with logging in successfully after sleep for a relatively long time, or after working with an external monitor, then ...
0
votes
2answers
2k views

Freezes on MacBook w/ Lion with Intel 330 SSD

I installed an Intel 330 SSD (120GB) in my MacBook (4,1) a few weeks ago. I reinstalled a fresh Mac OS X Lion (10.7.4) to make sure there are no issues with the new drive. However, since then I ...
7
votes
1answer
3k views

Why does my computer auto-restart after freezing (Lion 10.7.3), even when disabled?

Since recently upgrading to "Lion 10.7.3" I have had repeated instances of the machine hanging/crashing without warning and then silently restarting. Problem is, that such automatic restarts happen ...
3
votes
3answers
3k views

Why does my computer freeze when I unplug my headphones?

Whenever I plug in or unplug my headphones into my computer, it freezes for about 10 seconds before it is able to do anything which is rather annoying. This didn't use to happen though, would anyone ...
2
votes
0answers
5k views

Macbook freezes when connected (connecting) to new wireless router

So I have done extensive troubleshooting for my problem. When we moved to our new apartment and had a new fiber optic internet set up with, which came with a new wireless router, all the trouble ...
2
votes
1answer
2k views

Why does Force Quit Applications freeze?

When an app freezes on my app, I will press Command ⌘+Option ⌥+Esc ⎋ to open the Force Quit window. However, this will take minutes often, and clicking on the Force Quit button freezes the Force Quit ...
2
votes
2answers
2k views

How do I stop my MacBook Pro from randomly freezing when trying to go to sleep?

My 2011 MacBook Pro has been having a problem occasionally where I put it to sleep, but it continues to run. Later when I go use it again, I realize that it was on the whole time (usually inside my ...
2
votes
2answers
5k views

Mouse/Keyboard won't connect after being powered off

my iMac has recently developed an odd issue: If the mouse, or keyboard, is powered off (power button, or because I pull the batteries), and then powered on again, the device will not connect to the ...
1
vote
1answer
11k views

iMac doesn't start, all i see is colored lines and then checkered lines on a white background

I have iMac 2010 which is out of warranty. I recently came up to the computer and it was sleeping and was not waking up. I held the powered button for a while, so it turned off. Then I pressed it ...
0
votes
2answers
336 views

MacBookPro10,1 goes to gray screen when a USB is inserted

This is a follow up to my other question. Now the problem is sometimes when inserting a USB stick, the computer freezes and goes to a complete gray screen(kernel panic). It seems to only happen if ...
0
votes
1answer
661 views

Safari 6 freezing

I've recently upgraded to Safari 6 in Lion and I'm seeing some pages freeze: I cannot scroll down and sometimes cannot click on anything. Safari is still alive and working but the freeze cannot be ...
0
votes
1answer
186 views

Browsing in Finder is extremely slow while fine in Terminal

I did Repair Disk Permissions, reindexing files for Spotlight, and remove cache folders but it's still broken. It takes 30 seconds to several minutes to files to show up in local, not remote, folders. ...
0
votes
2answers
1k views

iMac freezing with graphical artifacts, what to do?

My iMac 27" from 2011 has recently been experiencing random freezes. It either restarts or I am forced to reboot (holding power button several seconds). When frozen the iMac does not respond to pings ...