You can make a difference in the Apple Support Community!

When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.

Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

rubenlx Author

Level 1

0 points

OSX Lion + 2011 iMac 27'' + Video = Freeze

Hello.

Got a brand new 27'' iMac, installed Lion. The machine freezes randomly when starting to play videos, either on Youtube, Quicktime, iTunes.

When it freezes, the mouse still works, but the machine doesn't respond to any command, requiring me to hit the power button and restart the computer.

Searched on kernel.log and system.log, and found no crash/error/message.

Anyone suffering from the same problem? The machine is pretty solid, been running some OpenCL kernels too and they are ok. It's only video decoding (possible on the GPU) that seems to freeze randomly.

iMac, Mac OS X (10.7)

Posted on Jul 21, 2011 6:46 AM

2,021 replies

Jul 23, 2011 2:25 PM in response to rubenlx

Similar problems here - freezing video on iPhoto and have to shutdown and restart to get up and running again. Get on it Apple.

Jul 23, 2011 3:09 PM in response to rubenlx

Same here for me. imac 27" i7 2011 12gb ram LION freezing when playing video in iTunes.

Yesterday received a message for the HDD recall, now LION keep freezing on videos. C'mon Apple.. What's going on?

Jul 23, 2011 3:51 PM in response to aixbo

It's not only the 27" iMacs becuase I have a 21.5" 2.7Ghz and the same problem occurs

Jul 23, 2011 4:34 PM in response to rubenlx

I'm afriad to say I'm having the exact same issue since upgrading to Lion. I'm on a base 2011 21" iMac. The freeze occurs randomly when attempting to play Quicktime or Flash videos (youtube, etc.) online. It is completely random, and the computer will freeze entirely, except for the mouse cursor. But I cannot click on anything, nor force quit. Only solution seems to be a hard reset with the power button.

Ran hardware dianostics and found no problems wiht hard drive or RAM. Hope fix is coming soon...

Jul 23, 2011 6:15 PM in response to ecphotographie

Same here. Installed Lion on my iMac and freezes during random programs, but mostly when viewing video.

Jul 23, 2011 8:11 PM in response to rubenlx

Yeah I been having this problem a few times too.

iFrodo

Level 1

45 points

Jul 23, 2011 11:20 PM in response to rubenlx

Simple question:

Did you do an update or a clean install?

If it's an update look at the logs (via Console.app) at about the times when you got these freeezes and try to find a culprit. Try updating Flash (try the beta 64bits version 11 for example), and try to remove all third party codecs for Quicktime (remove everything that is inside /Library/Quicktime (don't forget to backup them before doing so).

If you don't achieve to find one, try a clean install: boot on the new recovery partition and format your system partition using disk utility provided int his mode, then install Lion.

Of course, don't forget to do a backup before trying the clean install!

Jul 23, 2011 11:17 PM in response to iFrodo

It's getting quite ridiculous how often this issue happens.

asuwandi

Level 1

0 points

Jul 23, 2011 11:38 PM in response to BBryce

I spoke too soon. I still have the problem too.

Jul 24, 2011 3:08 AM in response to rubenlx

I have a brand new 21.5 upgraded model with 1TB. In installed Lion and immediately started having this problem with videos and YouTube. Does Apple usually respond in the forums or at least acknowledge that they're working on a fix? This is a crazy error to get on a new computer /OS.

Jul 24, 2011 3:17 AM in response to rubenlx

the same problem here, freeze with flash content 😟

OverHaze

Level 1

0 points

Jul 24, 2011 3:43 AM in response to rubenlx

I'm having the same problems on my three week old 27inch imac.

I'm scpetical about a clean installs ability to fix this issue but if anyone trys it and it actually works please share.

Jul 24, 2011 4:12 AM in response to andrewfromwest sacramento

FYI Apple has seeded Lion 10.7.2 to developers.

Jul 24, 2011 4:17 AM in response to rubenlx

If you're still under warranty, call the support line and let them know about this problem. If enough calls are about the same problem I would hope Apple will move a little quicker to remedy this.

Jul 24, 2011 4:30 AM in response to kirkmc

I encountered exactely the thame issue on my brand new i7 3,4GHz iMac 27" w/ 256Go SSD 4Go DRAM : all apps/finder freezed, only a useless moving mouse pointer. I still could remotely log on the iMac using ssh, but I couldn't avoid to do a hard reset (power off) to get rid of the freeze. The problem does not systematically occurs but happened to me while visiting websites integrating videos (flash, not sure).

when looking at the console, many debug info messages can be seen :

23/07/11 12:47:50,000 kernel: ** Device in slot: SLOT--1 **

23/07/11 12:47:50,000 kernel: ** GPU Debug Info Start **

23/07/11 12:47:50,000 kernel: 0x00006720

23/07/11 12:47:50,000 kernel: 0x0000008f

23/07/11 12:47:50,000 kernel: 0x00000001

23/07/11 12:47:50,000 kernel: 0x00000018

....

I guess we only have to wait for Apple techs to polish the new Lion 😉

I initially posted on this thread : https://discussions.apple.com/thread/3201795

OSX Lion + 2011 iMac 27'' + Video = Freeze