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.

mshashank Author

Level 1

4 points

External monitor issues for MBP 15 (2018) after update to Catalina 10.15.4

After updating my MBP 15 (2018) to Catalina OS 10.15.4, my external monitor connected via OWC dock (hdmi), starts up fine, but flickers and turns to blue within 5-10 seconds and remains that way! I tried resetting NVRAM, PRAM etc but nothing worked.

I don't see the issue when I load in safe mode and display seems to work fine , and also I don't see the issue when i use my work Mac book pro(same specs) which is on High Sierra. Hence it clearly seems to be some modification on the software side/drivers that's causing this. Any suggestions on a fix/ workaround to get it working would be of great help.

Thank you!

MacBook Pro with Touch Bar

Posted on Apr 26, 2020 7:52 PM

Top-ranking reply

leroydouglas

Community+ 2024

Level 10

188,286 points

Posted on Apr 27, 2020 5:40 AM

mshashank wrote:

After updating my MBP 15 (2018) to Catalina OS 10.15.4, my external monitor connected via OWC dock (hdmi), starts up fine, but flickers and turns to blue within 5-10 seconds and remains that way! I tried resetting NVRAM, PRAM etc but nothing worked.

I don't see the issue when I load in safe mode and display seems to work fine , and also I don't see the issue when i use my work Mac book pro(same specs) which is on High Sierra. Hence it clearly seems to be some modification on the software side/drivers that's causing this. Any suggestions on a fix/ workaround to get it working would be of great help.

Thank you!

Get help with video issues on external displays connected to your Mac - Apple Support  https://support.apple.com/en-us/HT201177

View in context

External monitor issues for MBP 15 (2018) after update to Catalina 10.15.4

Similar questions