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iM 4,1-14,4 2011 iMac Graphics Card Upgrade
- Thread starter MichaelDT
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Without the k3100m it boots and gets past the boot-chime, and works with a flashed k1100m and even with the original semi-functional amd gpu. The problem is that when I connect the display to the board, when I turn it on the screen turns on but remains black and it has the boot-chime loop. Although if I unplug the k3100m, boot the imac without it and reset the pram 3 times, and then put it back in and not attach the display, it no longer enters the boot-chime loop. So the issue seems to be the "flashed" k3100m. The boot chime loop appears when I attach the display, and then stays like that until I take the k3100m and reset the pram.
Edit: I'm having the exact same problem with the same GPU as @dream_catcher and even tried resetting the SMC and PRAM
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Holding alt during boot wakes up the internal screen, but not the external one unfortunately.
I know, I write in riddels. Possibly I should simply had answered: Check out the first post.
The solution for the black screen issue should enable external display ports, too. I will not do the reading of the first post for you.
Aha, thank you very much. Sorry for being an idiot, I'll try that patch.
There simply are individual cards that don't work, as also stated in the first post. Most of them do work in the late 2009 Core-i and 2010 iMacs.
Well, if it didn't work at all I would think that the iMac would not have booted at all, I also have a k3000m that apparently was dead on arrival, my iMac wouldn't even give me the ram beeps or get past the boot chime, with the k3000m
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Unfortunately, no. Followed the instructions, kextutil reported successful patch, but still no external displays. Though none of the linked AGC kexts refer to Big Sur, which I'm running. I used the newest one, which is for 10.15.7.Hope it works
Yes, something is working - but as soon as the screen is switched on, the Mac's EFI firmware seems to crash. Unfortunately that's as far as you can get with some cards - other apparently identical cards may work.
I didn't, my iMac wouldn't recognize it, but it works flawlessly in a Clevo
Yea, that's what I was thinking, unfortunately I don't have acces to a Clevo anymore so I cannot test it on Windows anymore :/
The AGC patch is included in some Big Sur patchers... you just need to find out in which. And it is a plist patch, not a replacement with older versions.
Hi boombari,
I've also had some issues (hangs) with the stephle ROM on my K3000M in a Mid-2010 iMac, also had issues with warm reboots and hanging. The system was working well with nikey22's last release, after he reduced the clocks. The clocks in the stephle ROM are higher than nikey22's last release, so I've adjusted the stephle ROM (reduced clocks, changed voltages) to match nikey22's last release. I've PM'd you a copy of the modified ROM which I also briefly tested on my own system in Win10 (heaven for ~5-10 mins) and briefly in macOS Mojave. Feel free to try it.
Regards,
Rob.
Thank you very much for your tip.
I think we can put this tip on the first post as well.
Because more often than not, after re-assembling everything on the iMac, it refuses to turn on and I didn't know why.
My wild guest ranging from short-circut LCD panel, broken LVDS socket, etc.... and I just leave the iMac dead...
Yup, I did Dell RX560 2Gb.rom. I used bootcamp. I found the issue to be the thunderbolt to USB3 adapter plugged into the thunderbolt port. Once I remove the thunderbolt to USB 3 adapter, the display output is fine.
Hi avryone!
I need some support with my 27 iMac 2011 GPU upgrade. I hope you can help make this job done step by step and want let many thanks in advance for supporting.
1. So actually my old GPU is totally dead and i bought replacement nvidia quadro K4100M.
2. I installed new GPU.
3 i received only 2 LEDs on motherboard and black screen. Also starup sound is apears after 30 20 second fans star working in full speed.
4. I have no any macOS installed on my imac have only windows 10.
What should i do now for make this card work properly? Can someone explain me?
I need some support with my 27 iMac 2011 GPU upgrade. I hope you can help make this job done step by step and want let many thanks in advance for supporting.
1. So actually my old GPU is totally dead and i bought replacement nvidia quadro K4100M.
2. I installed new GPU.
3 i received only 2 LEDs on motherboard and black screen. Also starup sound is apears after 30 20 second fans star working in full speed.
4. I have no any macOS installed on my imac have only windows 10.
What should i do now for make this card work properly? Can someone explain me?
No i didn't. How can i do it if i have black screen? Maybe using different pc and with bios clip?
Even with a black screen it should boot the linux stick. You will need another machine in either case, for SSH or flashing with a CH341a. Since you already have the card installed I'd suggest trying the linux method. See "Questions and Answers" on page 1, Q3 for instructions.
Ok will try CH341a method thank you. Also i have black screen without any back lights...