Graphics Corruption at Lock Screen

I'm having occasional graphics issues on my 2011 Macbook Pro since updating to Yosemite. I use my laptop a lot and it is set to lock when I close the lid or the system goes to sleep. Frequently, upon waking up my computer, I find a corrupted background on my login screen. See pictures below for two different versions of the problem. The login screen does function normally, but the graphics corruption is very concerning and unpleasant. Is anyone else experiencing this issue? Any ideas for a resolution?

MacBook Pro, OS X Yosemite (10.10)

Posted on Oct 21, 2014 1:18 PM

18 replies

con247

Level 1

0 points

Jan 22, 2015 6:43 AM in response to Kibidah

What was the cost of your logic board replacement? Did it fix your non-login graphics corruption?

Kibidah

Level 1

0 points

Jan 22, 2015 6:48 AM in response to con247

The flat-rate, out of warranty hardware fix was $310 +tax; they replaced the 2.0 GHz Logic Board and also the MagSafe Board. The non-login graphics corruption has not returned (I've had the machine back for 6 days).

Kibidah

Level 1

0 points

Jan 23, 2015 3:41 AM in response to 213JB

213JB wrote:

Backup.

Then try going to ~/Library/Preferences and move the file" com.apple.loginwindow" to the desktop, reboot and test

Several people here have reported success after following your fix. I'm attempting it, too, but have have found several files by that name. Any insight into which of these "com.apple.loginwindow" files should be moved to desktop? One? All? Thanks for any guidance you can provide!

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Graphics Corruption at Lock Screen