Gigabyte Z490 Vision D (Thunderbolt 3) + i5-10400 + AMD RX 580

[Ploddles]

Ah, so it is 19H15, later than 19H4. Not showing up here in the UK yet.

 

[CaseySJ]

For RC (old GM) you need a 'Developer' account.

View attachment 494332View attachment 494336

I am not a member of Apple Developer Program and yet I received this, which indicates that the Release Candidate is also a public testing release...

 

[Aldwinn]

I apologize for what might be slightly off topic, but I'm desperate. I ordered the parts on page 1 (except a I7 10700) and have have been trying to assemble them. Right now I'm at the stage with the cpu, 1 stick m2 storage, 1 memory stick. When I hook up the power, I get a brief flash and nothing else. I've swaped motherboards, cpus, power supplies, M2 storage and memory DIMM. No difference. What am I doing wrong?

(for reference, I had no trouble building the flash drive for doing the install, but obviously I cant do that until I can get something to turn on.)

And yes I tried googling for this issue and got nowhere...

Have you connected the power switch of your case?
Switching on the external power supply is not enough

 

[Trepamuros]

I have just upgraded OpenCore to 0.6.3 and Catalina to 10.15.7-19H15 as well without a problem.

My first update!

 

[CaseySJ]

I am not a member of Apple Developer Program and yet I received this, which indicates that the Release Candidate is also a public testing release...

Release Candidate installed: Build 20B5022a

 

[xdev]

Update: The screenshots show you're using iMac20,2. Please try switching to iMacPro1,1 for a few days and disable the Device Property for iGPU as shown:

View attachment 494019

hey Casey:

My build is using iMacPro1,1 and I have the Device Property for iGPU enabled. Everything seems to be running smooth. Should I disable the entry?

 

[dranose]

Did anyone install Catalina 10.15.7 Supplemental Update released earlier today?

ran earlier with no issues - took about 15mins.

 

[emistral]

At least one other person encountered this problem, but I don't recall the solution or workaround. Let's see if we can troubleshoot it here, and if successful, I'll add it to Post 1.

• What is the make/model of your monitor?
• Are you connecting via HDMI or DisplayPort cable?
• Was macOS installed from scratch, or was an existing macOS SSD transplanted into this system?
• What is the make/model of your RX 5700 XT?
• If there's a "Factory Reset" option on the monitor itself (via its on-board menu), have you tried a factory reset?
• What system name are you using? iMac19,1 or iMac20,2?
• If nothing else works, please try SwitchResX from here. There's a trial period, and a license is quite inexpensive. If you need help with SwitchResX, just ask.

It could be me. I have similar issues sometimes at startup. Have not figured out what it is. I have switchresx installed so I simply change the resolution and back. For instance, when this happens I am on 4k 60hz. I change to 4k 30hz, screen is back to normal then I change back to 4k 60hz.

 

[lewys]

It could be me. I have similar issues sometimes at startup. Have not figured out what it is. I have switchresx installed so I simply change the resolution and back. For instance, when this happens I am on 4k 60hz. I change to 4k 30hz, screen is back to normal then I change back to 4k 60hz.

Is Automatic Login enabled?

 

[HenryM]

Please run IORegistryExplorer --> File --> Save As... as post the saved file. That will show us the Thunderbolt configuration.

Here it is.