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Apologies if this is the wrong sub-forum. My system has been working perfectly for years. I can think of no recent config changes except attaching and detaching monitors. Suddenly I'm getting this (see photo). Can anyone help? Thanks in advance for any advice anyone can provide. Jordan

Mods: Please don't delete this! I posted it in two places (changing the title) and both got removed (redundant to each other). Thank you and apologies for the trouble. Compiling and running "Macserial" (meaning, the genSYMBIOS script that comes with OpenCore) gives an error: "Error checking for...

After lots of fiddling (and invaluable help from 1Revenger1 and others), I think I've resolved all the issues I was having with my OpenCore installer. Now, it gets to the selector — I select "Install macOS Big Sur" — it produces a bunch of logging — it stops — and then a "forbidden" circle...

I've been trying to get help here, debugging my new OpenCore USB Big Sur installer (which stalls out). Generally when I post questions here I get a wonderful overflow of detailed advice and information from many respondents. In this case — my two posts about OpenCore debugging — I've barely...

I've completed my USB Big Sur installer, and switched it to DEBUG mode (according to the guide). Booting stalls out the same way each time. The logs saved to the USB drive's EFI partition all look like this (below). Can anyone help me interpret this, and pinpoint why my boot won't continue...

I've completed my USB installer and am trying to run it. First I got a message about not finding a vault, so I changed the "Vault" entry in config.plist to "Optional" (as recommended). Then I stalled out at a black screen. Altering my install to allow debugging (according to the guide), I get...

After four great years with Clover, I'm starting over with OpenCore, to upgrade my Sierra machine to Big Sur on a new SSD (while keeping the old Clover/Sierra boot intact). I'm making my way through the OpenCore Install Guide. So far I've 1) Downloaded the full 12GB Big Sur installer 2) Used...

I'm rebuilding my Clover-based Sierra machine, using a new boot SSD, and starting over with OpenCore. Following the directions on dortania: I'm told I need to "know what ethernet card my system has" — but the ethernet plugs are right on my ASUS motherboard itself (there's no discrete networking...

I had three monitors going, with my old nVidia GeForce GTX 970 (running CUDA) — two identical Samsungs, via DVI and MiniDisplayPort (with an adapter), and a Wacom Cintiq Pro via MiniDisplayPort. After replacing the nVidia GPU with a AMD Sapphire Radeon HD 7950 3GB GDDR5, I can only run two...

I've been struggling for days to upgrade my four-year-old Sierra build (which is still running on the install and EFI that I perfected in 2017). I keep trying to make a bootable Big Sur install USB and it never works. (I want to install on a second, blank SSD I've installed, but I never get...

I've been running Sierra perfectly since 2017, with a fairly robust system (many drives; devices etc.). All working perfectly. (I can supply the details of my CLOVER install; EFI details if necessary). Motherboard — ASUS P9X79 WS CPU — Intel Core i7-3930K @ 3.20GHz Graphics — NVIDIA GeForce...

I just bought a used AMD Radeon HD 7950 from eBay — and only afterwards realized that Apple's list for Metal compatibility (with the new FCP X, etc.) specifies the "Mac Edition." Is this actually a real difference? Is it firmware, or a different physical connection? Can I still re-build my...