My Apple Cinema HD monitor no longer works on my iMacPro since upgrading to Catalina.

The connected display is flashing on and off - black screen for 5 seconds then showing my previous desktop for about 2 seconds.

The monitor worked before upgrading to Catalina.

Can anyone tell me if there is a fix for this?

iMac Pro, macOS 10.15

Posted on Apr 6, 2020 5:20 AM

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My Apple Cinema HD monitor no longer works on my iMacPro since upgrading to Catalina.

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