After we installed the newest update of OS X Mavericks which released on 27/1/2015, most of our teachers were facing the imac freezing issue. When their iMac turns from sleep to wake, the iMac will freeze and nothing work unless reboot

Question

After we installed the newest update of OS X Mavericks which released on 27/1/2015, most of our teachers were facing the imac freezing issue. When their iMac turns from sleep to wake, the iMac will freeze and nothing work unless reboot

Dear Apple support,

I am the IT support of a school in Hong Kong.

After we installed the newest update of OS X Mavericks which released on 27/1/2015, most of our teachers were facing the iMac freezing issue. When their iMac turns from sleep to wake, the iMac will freeze and nothing work unless reboot.

We have tested several setting, and found that if we unplug the VGA adapter(apple brand) and try to wake it up, the iMac will no be freeze. Before the update, all iMac were working normally. But after the update, all of teachers were facing this issue. all of them have VGA adapter plugged for projector connection.

Please help on this problem, currently I set all the iMac to non-sleep but just temporary solution. If they manually click to sleep, the iMac will still freeze after wake.

Thanks for concern!

Best regards,

Werner

iMac, OS X Mavericks (10.9.5)

Posted on Feb 26, 2015 4:14 PM

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Answer 1

a brody

Level 10

82,965 points

Feb 26, 2015 4:26 PM in response to WernerYue1004

You aren't speaking to Apple Support here. This is a user to user forum. To contact support visit http://www.apple.com/support/

The update you are talking about likely is the security update. Most security updates usually require a repair of permissions with Applications -> Utilities -> Disk Utility as a method of first troubleshooting them.

The behavior you are seeing is not normal for a video adapter. Since it is Energy Saver related, the signal for Energy Saver may be confusing the display as the adapter may not be getting the right signal across. The fact it is an Apple Adapter says something else may be wrong. Is the computer more than 4 years old? That may indicate a PRAM battery needs replacing.

If you clone backed up your computer, you may want to restore the backup temporarily to see if the issue really was with the update. You might be able to install 10.9.5 on a separate partition without the security update using Disk Utility to partition the machine. Only do this on a clone backed up system. Restore 10.9 and install the combo on its own partition:

OS X Mavericks 10.9.5 Update (Combo)

Then you can isolate the system without it to see if it indeed is the update, the update without any additional software installed, or only the update with additional software installed.

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Answer 2

Feb 26, 2015 4:46 PM in response to a brody

Hi Brody, thanks for your quick reply!

I did the disk utility check for permission and disk repair on problem iMac, but nothing can be found. PRAM, NVRAM are also reset.

They are iMac 21.5" which late 2013. I tried to find any way to roll back the software update but seems it is no possible to do on mac? Unfortunately, their iMac did not setup Time Machine backup😟

The timeline is : work normal before 2015-001 security update -> update to all iMac during holiday -> all teachers iMac with VGA adapter will be freeze after wake

Do anyone facing the same problem? Just search on web again and find this link: Sleep/wake crash OSX Mavericks, Macbook Air 2013

Do you think it is similar issue?

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Answer 3

Apr 15, 2015 9:37 PM in response to WernerYue1004

Hello WernerYue,

We are having the same exact problem!

We are on 10.9.5. Did you find any solution for this? It seems that the mac will freeze when waking up from sleep if its connected to a projector.

Our temporary fix was just to remove the thunderbolt connection (VGA adapter) when it freezes and plug back in, this switches all back to normal.

PhilC

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