Resolving Black Screen Issue on Hackintosh with Coffee Lake UHD 630 and 4K HDMI

Solution:

Addressing the black screen issue on a Coffee Lake UHD 630 when using HDMI on a 4K display involves several steps focusing on graphics configuration and compatibility:

1. Correct Kexts for Graphics: Ensure you have the correct kexts (kernel extensions) for your Intel UHD 630 graphics. Improper or missing kexts can lead to display issues such as black screens. The issue might occur because the kexts installed from your boot disk are not correct for your graphics setup​​.

2. BIOS Settings: Check your BIOS settings. Make sure that the Integrated Graphics is enabled and set as the primary display output. Additionally, ensure that the AHCI mode is enabled for SATA drives, as this can impact how macOS interacts with your hardware.

3. Graphics Patching: Depending on your specific Hackintosh setup, you might need to patch your graphics to support 4K resolution via HDMI. This can involve editing your config.plist file in the EFI partition of your boot drive.

4. Framebuffer and Port Configuration: Adjust the framebuffer and port configuration for your UHD 630. This might involve setting the correct platform-id and device-id for your iGPU in the bootloader configuration.

5. Cable and Port Check: Ensure that your HDMI cable and the port on your TV are fully functional. Try different HDMI ports on the TV.

6. Alternate Connections: If possible, test with a different connection method (such as DisplayPort) to isolate the issue to HDMI.

7. Monitor EDID Override: If the monitor is not being detected correctly, consider overriding the EDID (Extended Display Identification Data). Tools like Hackintool can help with this.

8. Consulting Community Forums: Look for similar setups in Hackintosh forums and see if others have encountered and resolved similar issues. You might find specific guidance or EFI configurations that work well with the UHD 630 and 4K displays.

9. Backup and Documentation: Keep backups of your working EFI configuration and document all changes you make for easy troubleshooting.

Visual Aids: Screenshots of your BIOS settings, graphics configurations, and any error messages can be helpful when seeking assistance from online communities.

Additional Note: Addressing graphics issues in Hackintosh setups, especially at higher resolutions like 4K, can be complex and might require trial and error with different configurations and settings.