External monitor not working with Blackmagic eGPU (NEC PA311D - iMAC 27)
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External monitor not working with Blackmagic eGPU (NEC PA311D - iMAC 27)  


New Member
Joined: 6 days ago

Hello everyone.
I try to connect my external 4k monitor to iMac through blackmagic eGPU. iMac detects monitor properly and shows it in configuration panel as external display with all parameters. Unfortunately I see only black screen, although indicator light is on and backlight lights up.
When I connect monitor directly to iMac it works properly.
I have tested this configuration with my MacBook Pro (Retina, 15-inch, Late 2013 ) and it works properly. Can someone help me? Please!

My configuration is:

iMac 27" late 2013
GeForce GT 756M 1GB
Intel Core i5
macOS Mojave 10.14.6 fresh installation (I tried on Catalina as well with the same result )
OS patched with purge-wrangler.sh

BlackMagic eGPU Radeon 580pro
External monitor: NEC PA 311D

iMac<>eGPU - Thunderbolt 2 cable with Thunderbolt 3 adapter
eGPU<>PA 311D - Thunderbolt 3 cable

This topic was modified 6 days ago

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.