Macbook Pro 15 with external monitors freezes when launching apps

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Macbook Pro 15 with external monitors freezes when launching apps

I have a 2016 MacBook Pro 15-inch 2.6 GHz i7 with Radeon Pro 450 2 GB. Whenever I'm using external monitors (3 to be exact), whenever I try to use Expose or open a new application, the computer locks up (no spinning beach ball) and will resume after 30-60 seconds. I'm guessing it's an GPU issue, but I don't know how to troubleshoot any of this. Hoping someone can help me here. Attached is an output from EtreCheckPro as suggested in other posts.

EtreCheckPro output

MacBook Pro 15", macOS 10.14

Posted on Jul 5, 2019 9:43 AM

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Answer 1

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leroydouglas

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188,388 points

Jul 5, 2019 11:39 AM in response to willwilson

willwilson wrote:

Whenever I'm using external monitors (3 to be exact),

MacBook Pro (15-inch, 2016)

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

Using 4K displays, 5K displays, and Ultra HD TVs with your Mac - Apple Support  https://support.apple.com/en-us/HT206587

Use the LG UltraFine 5K Display with your Mac https://support.apple.com/en-us/HT207448

from your EtrecheckPro—

Uninstall Symantec AV and try again. Use their official uninstaller.

Uninstall CCleaner.app

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Answer 2

Jul 5, 2019 12:30 PM in response to willwilson

willwilson wrote:

I have something required for my work called VIP Access from Symantec and I don't think it's causing any issues.

To trouble shoot further you can:

Try a SafeBoot https://support.apple.com/en-us/HT201262

Takes noticeable longer to get to the login screen, does a 5-15 minute disk repair before it fully boots up, and certain system caches get cleared and rebuilt, including dynamic loader cache, etc.

This test will tell you if third party interference; extensions etc are not loaded in safe boot mode.

Test issue in another user (or guest user) account https://support.apple.com/en-us/HT204443

This will tell you if it a universal issue or isolated to your user/admin account.

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Answer 3

willwilson Author

Level 1

4 points

Jul 5, 2019 12:02 PM in response to leroydouglas

Thanks for your reply & help. I've used these monitors for about a year with no problems, so it's not "how" I have them hooked up. Also I uninstalled CCleaner.app, but the only reason that shows up was because I've been trying to diagnose the problem for a couple days and was running that. I don't have Symantec AV, I have something required for my work called VIP Access from Symantec and I don't think it's causing any issues.

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Macbook Pro 15 with external monitors freezes when launching apps

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