How to Fix Prohibited sign after resizing partition During macOS Boot or Installation

Boot guide hackintosh OpenCore
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How to Fix Prohibited sign after resizing partition During macOS Boot or Installation

Boot failures need a predictable pass through firmware, USB, storage, EFI and verbose logs before reinstalling macOS. Most installer stalls come from firmware settings, an invalid config.plist, wrong SSDTs, bad USB mapping or unsupported storage/controller settings.

Quick Checks

  • Backup current state: Save a copy of your working EFI and run a full system backup before changing settings.
  • Identify hardware components: Note down your exact CPU, GPU, Wi-Fi card, and motherboard/laptop model.
  • Ensure utility alignment: Keep OpenCore, OCLP, and ProperTree updated.

Fix Steps

  1. Create a rollback point: Make a Time Machine backup and keep a copy of your last working EFI folder before editing OpenCore, kexts or root patches.
  2. Boot verbose: Add -v keepsyms=1 debug=0x100 so the final visible line gives a real clue.
  3. Check firmware settings: Disable Secure Boot and Fast Boot, set SATA to AHCI, disable CFG Lock if possible, and use UEFI mode.
  4. Validate OpenCore: Update OpenCore, Lilu and core kexts, then run ocvalidate or ProperTree clean snapshot.
  5. Recreate the installer: Use a fresh USB installer and try another USB port; older Macs may need a USB 2.0 hub for input during setup.
  6. Reset NVRAM: Reset NVRAM from the OpenCore picker before retrying the installer.

Verify It Worked

  • Verbose boot moves past the previous stopping line.
  • The installer reaches Disk Utility and sees the target disk.
  • Keyboard, mouse and USB remain active during recovery.
  • OpenCore picker still loads after a cold boot.

Rollback

  • Restore the last booting EFI folder.
  • Use the officially supported macOS installer to recover the machine.
  • Do not erase the internal disk until the installer can boot twice consistently.

Related iATKOS Searches

Original Question: "Prohibited sign after resizing partition"

NOTE: I'M NOT A NOOB, I'VE DONE A LOT OF HACKINTOSHES AND I KNOW WHAT THE GUIDE HAS AND DOESN'T HAVE.

Hello fellow hackintoshers, I seem to be having a problem with my volume now being unbootable after shrinking it down to make space for another NTFS partition on the same drive which I wanted to use for data only. I shrunk the APFS partition using Disk Utility and created a new blank exFAT partition in the unused space. Back in Windows (which is installed on a different drive) I formatted that exFAT partition into NTFS. However, now my hack won't boot at all. I'm trying all I can but I just wanted to see if anyone else has had a similar issue. Thanks!

The verbose output shows some error relating to an AHCI controller with error code 0xe0030005 on repeat.

submitted by /u/obrisacuovoposle
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