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.

white flashing lines on screen macos 10.12.4

Since upgrading to macOS10.12.4 I note white flashing lines when playing video content (i.e. BBC news, youtube, etc). Occasionally i see the screen flashing when I have a darker background. Anyone else out there with the same problem?

Posted on Mar 29, 2017 4:59 AM

Reply
Question marked as Top-ranking reply

Posted on Mar 30, 2017 12:04 AM

Please try this, if you have not already.


Go step by step and test.


1. Start up in Safe Mode. https://support.apple.com/kb/PH21875?locale=en_US

2. Repair Disk. https://support.apple.com/kb/PH22243?locale=en_US


3. Reset NVRAM/PRAM. http://support.apple.com/kb/PH18761


4. Reset SMC. Choose the method for “On Mac notebooks with non-removable battery”.

https://support.apple.com/en-us/HT201295

2 replies
Question marked as Top-ranking reply

Mar 30, 2017 12:04 AM in response to JdeJ

Please try this, if you have not already.


Go step by step and test.


1. Start up in Safe Mode. https://support.apple.com/kb/PH21875?locale=en_US

2. Repair Disk. https://support.apple.com/kb/PH22243?locale=en_US


3. Reset NVRAM/PRAM. http://support.apple.com/kb/PH18761


4. Reset SMC. Choose the method for “On Mac notebooks with non-removable battery”.

https://support.apple.com/en-us/HT201295

white flashing lines on screen macos 10.12.4

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.