eGPU monitor randomly? stopped working
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eGPU monitor randomly? stopped working  


New Member
Joined: 1 year ago

I have an eGPU setup I've been pretty happy with for a while now:

- MBP 16"

- Razer Core X (connected via Thunderbolt 3)

- Radeon RX 580

I've done no custom configuration or kexts—this is all (AFAIK) fully supported by Apple

I use an old iMac as a second monitor, connected to one of the DisplayPorts on the RX 580, which works great.

Recently I got a new monitor, an HP 27f 4k. I connected this to an HDMI port on the RX 580, and had some problems with the computer only recognising it intermittently, so I switched it to the other DisplayPort on the RX 580, and that's worked great for a couple weeks now—until this morning, when the HP monitor stopped working, and I can't figure out why.

Both DisplayPorts on the RX 580 seem to work fine (the iMac monitor works in both). The HP monitor works ok if I plug it straight into the laptop (with HDMI and an adapter), but insists it gets no input from the RX 580 whether I plug it in via DisplayPort or HDMI. If I unplug the iMac (so the HP monitor is the only display connected to the RX 580) it still doesn't work.

I've also reconnected the eGPU, restarted several times, reseated the graphics card in the eGPU, etc—to no avail. How can I fix it?

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