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Author Topic: Ultimate (iMac) MXM efi rom/vbios thread...  (Read 222131 times)
mugen888
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« Reply #75 on: May 03, 2013, 06:08:27 PM »

Done, all working fine. Rominator, i take it you were joking when you offered to flash one for me.

Im no pro but my advice to you two would be.

Stel Maar - You can get a reflow of your 8800GS (cheap option) or reball (more expensive) this should fix your problem. 8800GS MXM cards are hard to find.

Ziofunk - "Specialist service fix",  is this reflow? if so try get a reball that should fix it. Alternatively you could do what i did find a MSI 7600GT (same as the iMac 7600GT) and flash with iMac 7600GT bios.

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kinheng
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« Reply #76 on: May 10, 2013, 01:46:59 AM »

I have came back to read this thread a few times. I am still stuck with my 2008 Imac 24".
Most of the people here discuss solution for their white 2006 imac 24".

Will the similiar solution work for the aluminium Imac?
My Radeon HD 2600 died and I think I have destroyed it by overcooked it.

will the suggested solution in this thread's previous post (MSI 7600 with GDDR3) work for Aluminium IMac 2007-2008 ?

Has anybody else have bad HD2600 in their 2007-2008 Imac and found a solution?
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gbuyer
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« Reply #77 on: May 22, 2013, 04:17:20 PM »

I have the same problem - imac 2008 24 inch, dead (well, going to be dead due overheating) ati hd2600. I did not get a solution right now. So please help us!

I have came back to read this thread a few times. I am still stuck with my 2008 Imac 24".
Most of the people here discuss solution for their white 2006 imac 24".

Will the similiar solution work for the aluminium Imac?
My Radeon HD 2600 died and I think I have destroyed it by overcooked it.

will the suggested solution in this thread's previous post (MSI 7600 with GDDR3) work for Aluminium IMac 2007-2008 ?

Has anybody else have bad HD2600 in their 2007-2008 Imac and found a solution?

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joshua
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« Reply #78 on: June 07, 2013, 02:52:14 PM »

Hi Guys,

I have the same issue as some people, i mean the dead Ati Radeon HD 2600 Pro.
So i bought an Acer part which is a Nvidia Geforce 9600m GT with MXM II specifications but no luck.

The good point, but maybe not, is that i can boot the iMac and use it with Apple Remote Desktop but also see the Graphic Card details in "system information" (check the attached file).

Now, any idea what i can do?
If someone can patched my rom i would pay him.

Thanks.
Josh.


* Capture d’écran 2013-06-07 à 20.18.31.png (83.95 KB, 745x515 - viewed 2260 times.)
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JonathanHorton
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« Reply #79 on: August 13, 2013, 07:29:25 AM »

@lion10

Dude, I read all your post and seems like you are the person who I can direct my question to
and any help would is MUCH MUCH appreciated.

I have an 24" alum. Imac 2008, and I believe suffer from GPU failure
I was wondering the symptoms provided below match what you have experienced / can confirm
before I spend $ to buy any parts and not able to fix the computer

Symptoms:
1. led light 1&2 lite up on logicboard when power button is pressed, LED 3 flash quickly. (GPU in place)
2. Was able to boot when GPU is not connected (of course nothing shows on screen)
3. system boots and got into OS and was able to remote control system when GPU was disconnected.

Any thing you can share is again Much Much appreciated (I loved the computer! but seems like GPU failure is inevitable and common)
do you have a extra working GPU for sale?
or any Recommendation for an replacement?


hello friend i Know thread is bit old but I am facing similar problem? Can you help me in sorting it out?Looking forward for quick reply... Thanks:)
« Last Edit: August 13, 2013, 05:19:34 PM by JonathanHorton » Logged
8ternity
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« Reply #80 on: October 03, 2013, 03:01:55 AM »

HI Everyone,

I had an iMac A1200 6.1 which the videocard has been reballed with an new GPU, same GPU,and i get problem after reballing a new GPU.

I would like to know if it need another step to do when we reballing a new GPU on an apple Ge7600GT card? Like eprom update or something else? Because the card was defect and need to be reballing and i was getting an GPU replacement on recommendation, but the apple powerup, fans runs, but no picture and no booting.

Led 1 and 2 is on, led #3 not lighted.

Thanks
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qednet
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« Reply #81 on: July 09, 2014, 12:25:19 PM »

Finally waded through all of this thread! I'm hunting a fix for iMac 24" 6,1 with a defective video card. Here's what I have discovered.

1. Zeus software for the mac, helpful info but useless to me. Still it's good background material. The other thing worth reading is The Golden Guide to Flashing Graphic Cards over  at http://forums.macrumors.com/showthread.php?t=877441

2. The 9600M I bought (for an Acer lappie) has the expected black screen for OSX and corrupted video on Win/Dos/Linux. Curiously the non-OSX boot generates a report that says "Error: MXM Structure not found or invalid." I had hoped flashing the card would at least fix that but alas no such luck.

3. Flashing is probably best done with Freedos. I found this link https://wiki.archlinux.org/index.php/Flashing_BIOS_from_Linux which worked almost perfectly, best if you give your rom a short name like new.rom or something. There is also a thing called NVflash which I got from http://www.techpowerup.com/ - I created a bunch of boot CD's but this process works very well.

4. The MSI GO 7600 are more scarce then pulled iMac 7600 or 7300 cards and they are as plentiful as hens teeth.

5. As things stand I will end up with another iMac 24 since that's the cheapest fix but it's very annoying. Especially since it seems to boil down to a mere 64k of EFI code that locks out all the PC cards on a Mac. Dark thoughts about vendor lock in and astronomical profits notwithstanding I will keep looking for a cost effective solution but so far I've spent literally days trawling the web looking for possible solutions. The frustrating thing is it really appears to be a dead end.
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aurejac
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« Reply #82 on: August 14, 2014, 10:53:33 PM »

Hi,

Time has passed, and juste to put a little note on this :

As for 24" iMac 6.1 : MXM replacement cards are becoming extremely hard to find.
Those models of iMac only work with G73 mxm cards with DDR3, similar to the original 7300GT or Go7600GT (efi 32 bits).
good luck with finding replacement cards they are scarce...

As for iMac 7.1/8.1 : they also have a high failure rate of video cards, either with the 8800GS or ATI 2400xt / 2600xt.
Apple doesn't sell parts any more.
It seems to be quite easy to find brand new, 8800GS MXM cards with exactly the same design from Apple.
Those ones for example are stricly the same design :
http://www.ebay.com/itm/nVidia-8800M-GTS-G92-700-A2-512MB-MXM-III-HE-VGA-Video-Card/

Here is a comparison between original Apple 8800GS card (in blue) and replacement green nVidia 8800gs :


they look similar don't they  Smiley

Flashing is quite easy with the following steps :
- install the new 8800GS MXM card into the iMac
- drop in a HDD with only a bootcamp (windows xp) installation
(I use a HDD on which I restored a winclone backup of a working XP installation)
- let the iMac boot on the bootcamp xp partition
- use nvflash to restore the 8800gs rom dump...

Here is a dump of iMac 8800gs rom :
http://gilles.aurejac.free.fr/imac_mxm/8800gs-imac81.rom.zip

Works quite well :


regards
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tlamb19
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« Reply #83 on: September 26, 2014, 01:55:05 AM »

Hi,

I have a 20" Early 2008 iMac (8,1) and my 2400 XT which is in it currently just isn't cutting it. I'm looking to upgrade to a higher card. I found http://goo.gl/6oEm3j thread on macrumors that stated my machine can be upgraded to an 8800GS, so I was thinking of doing aurejac's method. When I found an 8800GTS, it has three tabs on the bottom, presumably one for extra power. When looking on ifixit, in the pictures of the graphics card for my machine, I see only two tabs. This leads me to wonder if my iMac will have the connector with that extra power tab. Can anyone confirm that the iMac does or does not have the capability of installing an 8800GTS? Any help appreciated!
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poll_rom
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« Reply #84 on: October 18, 2014, 10:14:59 PM »

Hi,

I'm new here. I come from Europe so sorry for my bad English and I follow this topic for a while.
I have a bad iMac 8.1 with a NVIDIA 8800GS. So it's possible to solder EEPROM chip off from the original 8800GS and place it on a other 8800 card?
And which cards are compatible for this method?
Some posts above I saw the MSI, because it have DDR3 RAM. But are there more?

Many thanks.





did you fix your iMac 8.1 ?
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jahelin
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« Reply #85 on: October 20, 2014, 11:18:17 AM »

Is information on the radeon 5xxxx, 6xxx thread relevant for iMac users? As I posted in a separate thread, I have 6870m from an alienware laptop and was hoping for it to work. I really do not know much about gpus and the basic stuff like how suitable m versions are for flashing compared to the desktop ones would be useful. There were some posts on this forum that mxm cards would be hopeless, but based on this thread this is not the case.  I could put some more effort in replacing the card, but if no suitable roms are expected to be out there, I think the limits of my tinkering effort will be reached before a working solution is found. 
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aurejac
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« Reply #86 on: July 29, 2016, 11:33:56 AM »

Hi,

I have a 20" Early 2008 iMac (8,1) and my 2400 XT which is in it currently just isn't cutting it. I'm looking to upgrade to a higher card. I found http://goo.gl/6oEm3j thread on macrumors that stated my machine can be upgraded to an 8800GS, so I was thinking of doing aurejac's method. When I found an 8800GTS, it has three tabs on the bottom, presumably one for extra power. When looking on ifixit, in the pictures of the graphics card for my machine, I see only two tabs. This leads me to wonder if my iMac will have the connector with that extra power tab. Can anyone confirm that the iMac does or does not have the capability of installing an 8800GTS? Any help appreciated!

Hi,

sorry for so late answer...
The 8800GS is too big to fit into a 20" iMac. You have to find another 2400xt.

Also, I managed to find that the dump of the Apple original 8800gs I published does not work well with Lion and laters OSs on some PC Nvidia cards...
So I did modified the rom to work best with 10.7 up to 10.11.6
basically, I only change the ID and subsystem ID with Nibitor.

This version works flawlessly with the new Nvidia 8800M reference 180-10398-0002-A04 one can buy on some places :
http://gilles.aurejac.free.fr/imac_mxm/8800gs_iMac_0609.0690.107B.rom.zip

It can be applied under bootcamp with Nvflash, feel free to use it.
Hope it will enable some of those old iMacs to continue working...
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Giant2
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« Reply #87 on: October 28, 2016, 03:55:22 PM »


Hi, ausejac
I  have used the same chip version card from other computer and I have as result BLACK SCREEN but iMac Start and normally sound chim :OOO

http://www.4shared.com/photo/dyVJ-Uv9ba/MXM_7600_GF-G07600-N-A2.html

Have you any idea from possible trouble ?
PS I no loaded any ROM video

Thanks
 Smiley
« Last Edit: October 28, 2016, 08:18:00 PM by Giant2 » Logged
Rominator
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« Reply #88 on: October 31, 2016, 11:46:38 PM »

is this a question?

PLease fix the quote thing
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Giant2
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« Reply #89 on: November 03, 2016, 03:44:41 PM »

is this a question?

PLease fix the quote thing

Sorry for my english!

My problem is that I have now replaced the video card without being able to flash the ROM Apple.
I do not have the VGA cable to connect a conventional external video and I never installed Bootcamp with Windows in order to get a DOS prompt C> (for next flashing operation)
When I turn I hear the Apple sound (chimay) but I see black, so so I thought about using a DOS\Windows bootable disk for obtain DOS prompt.(I should buy the mini-DVI
 to VGA adapter).
Have you any idea to suggest me about my situation?
Thanks too much




« Last Edit: November 03, 2016, 03:46:57 PM by Giant2 » Logged
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