I’m at a bit of a loss and hoping someone has seen this before.
Machine
Late 2013 iMac
500GB Crucial MX500 SSD
NVIDIA GPU (GT755M/GT775M depending on model - can confirm if needed)
Background
Machine was running Ventura via OpenCore Legacy Patcher without issues.
I mistakenly updated macOS without checking OCLP compatibility first.
After the update:
Normal boot hangs.
Safe Mode boots successfully.
I assumed it was an OCLP/root patch issue.
Things I’ve tried
Reapplied OCLP root patches.
Reinstalled OpenCore.
Safe Mode still works, normal boot still hangs.
Erased the SSD completely from Recovery.
Reset NVRAM/PRAM.
Reset SMC.
Created an official Catalina USB installer using Apple’s createinstallmedia on another Intel Mac.
Removed OpenCore entirely.
Current behaviour
Catalina USB
Boots.
Apple logo + progress bar.
Eventually hangs before the installer appears.
Verbose mode stops around
Setting BTCoex Config
(I know this is probably just the last printed message.)
Internet Recovery
Downloads successfully.
Gets to the loading screen.
Screen freezes.
However…
VoiceOver works perfectly.
If I enable VoiceOver it speaks menu items, language selection etc., meaning Recovery appears to be running in the background while the display never updates.
That makes me think the graphical interface is freezing rather than Recovery itself.
Other oddities
Ventura would only boot in Safe Mode.
Catalina installer hangs.
Internet Recovery hangs.
VoiceOver continues working underneath.
Questions
Has anyone seen this after an OCLP update gone wrong?
Could this still be software/firmware related, or does this now strongly point to a failing NVIDIA GPU?
Is there anything else worth trying before I declare the hardware dead?
Apple Diagnostics won’t launch either.
A Windows 10 USB created with WinDiskWriter on an M3 Mac doesn’t even appear in the Option boot picker.
I’m trying to determine whether I’ve somehow corrupted firmware/NVRAM, or whether the unsupported update simply exposed a GPU issue that was already developing.
Any ideas would be greatly appreciated.
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⚠️ WARNING:
Installing macOS Tahoe on unsupported hardware is NOT supported by the OpenCore Legacy Patcher developers. Please be aware that numerous users have attempted installation, often resulting in serious issues including hardware malfunctions and complete data loss.
Also understand that OCLP supports over 83 Mac models! Just because it "worked" on one, does not mean it will not cause major issues on your device.
NOTE: You might have seen a new piece of software called OCLP-Mod. The OCLP developers do NOT recommend using any modification of the genuine OCLP software. Keep in mind, anyone is able to make a fork of OCLP (a fork is a modification of the original project). No other software is checked and verified safe or actually working on all 83 Mac models.
In closing, please only use the genuine version of OCLP. Do not install Tahoe until a fully compatible public version of OCLP is released. Thanks!
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