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[Bug]: black screen with only cursor

September 6, 2026 · by @Pedroinsti

bug

Mac model / Mac-Modell

T2 — MacBook Pro 13-inch (2018, 4 Thunderbolt 3 ports)

Target macOS version (if it is about malicious forks, typosquatting sites or security vulnerabilities, write - instead) / macOS-Zielversion (falls es um Typpfehler-Webseiten, Typpfehler-Repository oder Sicherheitslücken handelt, schreiben Sie stattdessen ein - )

macOS Tahoe 26.6.2

OpenCore Legacy Patcher T2 version

4.0.0.18003.1 - 4.0.0 alpha 18.3.1

Issue type / Typ Fehler

Boot failure / Startfehler

Description / Beschreibung

It sarted good i followed all steps but it keeps getting black screen with only cursor

Steps to upload the logs of the kernel panic if any (if not, you can skip this step or write -) / Schritte zum Hochladen der Protokolle des Kernel-Panics, falls vorhanden (falls keiner, dann Sie können das überspringen oder einen - schreiben)

No response

Panic log (if any) / additional notes (if any) / Panikprotokoll (falls einer) / zusätzliche Notizen (falls einer)

Comments

@Medelcartelinc · September 6, 2026

Hi!
The black screen with only a movable cursor means WindowServer has initialized the display surface, but loginwindow / SecurityAgent is crashing in a loop before rendering the login UI.
We had the exact same issue on Touch Bar models:

1. When Touch Bar / security daemons attempt to bridge to the security controller during boot, an ABI mismatch causes SecurityAgent to segfault every 10 seconds, leaving the display black with just the cursor.
2. If you are able to reach Terminal via Recovery or SSH, running tail -f /var/log/system.log will show SecurityAgent respawning continuously.
3. For now, boot with -nokcmismatchpanic keepsyms=1 -amfipassbeta in your OpenCore boot-args, and make sure amfi=0x80 is NOT present (as it breaks entitlement verification in the login session).
   We are tracking this specific loginwindow hang in our latest beta branch.

@Pedroinsti · September 6, 2026

I don't understand that's to advanced for me could you guide me and help me

@Pedroinsti · September 6, 2026

Like where do I modify those values

@Pedroinsti · September 6, 2026

where I put it

@albert-mueller · September 6, 2026 · edited

where I put it

Sie benötigen dafür OCAT, um OpenCore-Einstellungen (nicht mit OCLP zu verwirren), um diese Boot Argumenten zu hinzufügen. Sie können OCAT von hier herunterladen: https://github.com/ic005k/OCAuxiliaryTools/releases/tag/20250001
Denn, OCAT öffnen, und gehe zu NVRAM
Denn, finden Sie die Sektion 7C436110-AB2A-4BBB-A880-FE41995C9F82 (oder sowas)
Denn, klicken Sie neben boot-args und achten Sie darauf, dass alles in boot-args deselektiert sein
Denn füge diese Boot-Argumenten hinzu, die @Medelcartelinc gennant hat
Sorry but wasn't sure how to explain it in English, that's why I wrote in German instead.

@albert-mueller · September 6, 2026 · edited

@Pedroinsti

@Pedroinsti · September 19, 2026

where do i put that this is blank

@albert-mueller · September 19, 2026

where do i put that this is blank

You likely clicked the option to mount the EFI without opening the config.plist. What you can do is go to Finder, and find a partition called EFI, then right click the config.plist > Open with > OCAT

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