iM 4,1-14,4 2011 iMac Graphics Card Upgrade

[dorninko]

I don't think you need another BT/WiFi card. What about the D+ D- connection?

Have you re-installed OCLP on the EFI and done the post-install?

 

[ethanstiles]

Did you re-install the OCLP? When installing a different WiFi/BT card then you need to reinstall OCLP (EFI and post).
Another cause might be that the +3.3V connection was broken during re-assembly of the iMac? Or that there might be a short somewhere on the WiFi/BT card due to some contact to the GPU, I had this issue once because the position of the card is very close to the GPU.

The wifi still works fine, but the card has not been modified with any connections.

I have had the wifi card for awhile. I believe I installed the card and that’s it, no other mods or software changes.

Where would I disable the original bluetooth card in the 12,1? I have a bluetooth usb adapter that was working before.

 

[snackbar]

I am going to have to reinstall the old graphics card and do the firmware update process and reinstall new card unfortunately. Doesn’t seem like there is another option as I do not get native boot picker or ability to boot in el capitan. Interestingly, I can still see the high sierra os after choosing it from the OC boot picker and using a VGA cable to external monitor.

To to put this easy for my daft mind: If my bootrom is already at 87.0.0.0.0, I don't have to do anything. Because on the one machine that's still responding, this is the case. Original HDD and original GPU and a High Sierra install if I wanted to update a different machine, yes?

@snackbar WX4150 can run Sonoma, try holding shift though the boot screens until you get to the progress bar.

Walk me through here as I still end up on a black screen with the backlight on even after another install: Hold shift beyond the picker? I'm currently holding shift, OCLP posts something along "entering safe mode" and going into recovery mode. Whatever I choose here, I won't be booting into any OS.

Yes, Sonoma's installed. 1, 3, 4 LEDs (left to right) on the board are lit. Installed with the following settings for my 12,1:


Still: I can option key into EFI picker, clean the SSD, install fresh Sonoma and still end up after several reboots including a white screen, apple logo, progress bar and time until finished on a blank screen with the backlight on. My bootrom is 87.0.0.0.0.

Again: This is on a 2nd 12,1 machine with different hardware. Even the WX4130 is different (yes, it's flashed).


And I also found this tool on github to update your Bootrom: https://github.com/MuertoGB/MacBRTool
Somebody tried this?

 

[dorninko]

The wifi still works fine, but the card has not been modified with any connections.

I have had the wifi card for awhile. I believe I installed the card and that’s it, no other mods or software changes.

Where would I disable the original bluetooth card in the 12,1? I have a bluetooth usb adapter that was working before.

Look at this thread https://forums.macrumors.com/thread...011-802-11ac-bt-4-0-internal-upgrade.1780242/ for details.
If you want the BT of your new card working then you need to do these HW-mods. But if you keep your old internal BT card then you don't need these mods. Usually the old card works with OCLP but maybe somethings different in your case.