CaseySJ
Moderator
- Joined
- Nov 11, 2018
- Messages
- 22,227
- Motherboard
- Asus ProArt Z690-Creator
- CPU
- i7-12700K
- Graphics
- RX 6800 XT
- Mac
- Classic Mac
- Mobile Phone
The problem is as follows:Doesn’t make sense, IGPU doesn’t have video output, only the changes for the AMD Gpu should be visible.
Please change to iMac Pro 1,1 and disable the IGPU. Now with 10.14.5 update should work.
Your problem is a black screen or only the login screen?
- When connecting the Dell monitor via DisplayPort, he can see the Apple Logo and progress bar during boot.
- But near the end of the boot process, Mojave initializes the real video driver (instead of the generic non-accelerated driver).
- When the new driver is initialized, the screen goes black and remains black.
- But if he simply turns the monitor off and then on, the screen works normally and he can see the Login prompt.
- The Dell monitor does not seem to be synchronizing to the new DisplayPort video signal after the real driver loads.
- But the HDMI port on the same monitor does not have this problem. Only the DP port has the problem.
However, he does not experience this problem with Windows.