GUIDE How to Fix Black Screen issue with MacPro 6,1 and iMac 15/17 System Definition (NVIDIA/AMD)

[EliteMacx86]

How to Fix Black Screen issue with MacPro 6,1 and iMac 15/17 System Definition (NVIDIA/AMD)​

If you're using MacPro 6,1 or iMac 15/17 as a system definition, then you might have a black screen as macOS finishes loading. This is because the MacPro 6,1 and iMac 15/17 performs a special function on their specific OEM GPUs and displays. For non-Apple hardware, this will cause a black screen.

There may be another issue and you might start to use this fix. But before that, you should verify that this is the only issue, not others. So here's a way to determine if the system is running/functional.

1. Check if the system fan is running. The CPU fan.
2. Check if the power LEDs are blinking.
3. If you're having an optical drive installed, eject the drive and check
4. Boot using nv_disable=1 and then check

After confirming, you can go ahead and fix this issue.

Here's an easy Clover patch-on-the-fly fix for it (credit to Pike R. Alpha). And you can use Clover Configurator for a user-friendly way of adding it into Kernel and kext Patches section

Name: com.apple.driver.AppleGraphicsDevicePolicy
Find* [HEX]: BA050000 00
Replace* [HEX]: BA000000 00
Comment: Prevent AGDP from loading

Here's what it should like once added.

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Alternatively, you can also use Lilu & WhateverGreen kexts to achieve the same effect. You might need to make sure they're always up to date, thought, just in case.

 

[stp]

Hello ! I have blank screen problem after boot. everything else is working but not getting display output. my motherboard has only VGA port for display output .Is there any fix for this ? this happened after applying fix for intel HD graphics 630 . if i remove that patch it boots with display but no GFX acceleration. i have attached config file. my motherboard has only VGA port for display output.

 

[EliteMacx86]

Hello ! I have blank screen problem after boot. everything else is working but not getting display output. my motherboard has only VGA port for display output .Is there any fix for this ? this happened after applying fix for intel HD graphics 630 . if i remove that patch it boots with display but no GFX acceleration. i have attached config file. my motherboard has only VGA port for display output.

This is only valid for NVIDIA and AMD.

 

[yuanyasmine]

Hello ! I have blank screen problem after boot. everything else is working but not getting display output. my motherboard has only VGA port for display output .Is there any fix for this ? this happened after applying fix for intel HD graphics 630 . if i remove that patch it boots with display but no GFX acceleration. i have attached config file. my motherboard has only VGA port for display output.

I have been a mac user for ten years and have encountered this problem several times. Initially, you should follow these steps when your Mac does not start the guide:

https://iboysoft.com/mac-data-recovery/mac-wont-boot-what-to-do.html

Please describe the result of the following steps:

1. can you boot into recovery mode from partition or internet recovery?

2. can you boot in safe mode?

3. can you start in Safe Verbose mode - it starts to load then ends in a blank gray screen.

4. Start in single user mode if you can, then run fsck -fy. Do you have an error message? during the restart, are there any error messages?

if you say yes, you may be able to repair your Mac. if you answer no and you can only load then find yourself in a blank gray screen, there is a problem with the hardware, the motherboard maybe. in this situation, please ask for help from Apple Support.

5. reset NVRAM and SMC. does that make any changes?