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Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac12,2

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problema gpu non rilevata

'Italian: Ciao a tutti,

Possiedo un iMac 2011 da 27 EMC2429 ha sempre funzionato correttamente fino a quando qualche mese fa ha iniziato a dare problemi,nello specifico lo schermo si spegneva o dava immagini l contrario puntini ed altri sintomi della scheda video danneggiata una AMD 6970 1 GB.

Alla fine dato che era impossibile usare il mac ne ho comprata una nuova stesso modello ma da 2gb,purtroppo una volta rimontato il tutto il mac da schermo nero e dopo ulteriori test ho notato che dei 4 led presenti sulla scheda madre solo 2 si accendono ed il 3 e il 4 restano spenti quindi la scheda video sembra non rilevata.

qualcuno ha avuto un problema simile o sa quale componente potrebbe essersi danneggiato? (ho gia' testato la scheda video su un pc e viene rilevata e funziona)

English: Hello everyone,

I have a iMac 2011 by 27 EMC2429 has always functioned properly until a few months ago it began to have problems, specifically the screen goes off, or gave the images contrast dots and other symptoms of a damaged video card AMD 6970 1 GB.

At the end since it was impossible to use the iMac I bought a new same model but from 2GB, unfortunately once reassembled the whole iMac black screen and after further testing I noticed that the 4 LEDs on the motherboard only 2 come on, and 3 and 4 are turned off so the video card seems not detected.

Someone had a similar problem or know which component may have been damaged? (I have already 'tested the video card on a PC and is detected and it works)

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Batterie per PC portatili

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Batterie per PC portatili

Una soluzione semplice per un grande aumento di potenza.

Acquista ora

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Questa risposta era destinata originariamente a un'altra domanda.

Sadly, this board won't work without flashing the ROM firmware on it to the Apple firmware.

I would recommend you return it and get the correct board. You need to find a real Apple board here is the Apple P/N: 661-5969 for the 2 GB board. The 661-5967 is the 512 MB version and the 661-5968 is the 1 GB version of the board. If you goggle the part number with Apple as the prefix you should be able to find it.

Unless you are doing something very heavy in graphics the 1 GB should be more than enough. I would focus on the systems RAM and adding in a SSD drive to gain better performance here than over focusing on the GPU's RAM.

Update (05/10/2016)

Sorry, this model doesn't have intergraded graphics on the CPU. You'll need to wait until you have the correct MXM graphics board.

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hi,thanks for the reply,the problem is that i can't return the board,so now i must sell it.

maybe could be possible change the firmware or i can only buy the correct board?

da

Sadly, I don't think you can flash the board you have at this point as you will need a working board to image the firmware from. Since you sold yours already you have no source to image from.

Sounds like your only option here is getting the correct part.

da

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Risposta Più Utile

You mean you have the video that caused a class action law suit and resulted in this

"iMac (27-inch): AMD Radeon 6970M Video Card Replacement Program":

https://support.apple.com/en-us/HT203787

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Commenti:

yes this was my video card,i know the replacement program,but my mac was already open from me for add an ssd and replace the superdrive with another hd,so i thought to replace the graphics card on my own,and unfortunately i had already sold the original gpu to buy new one

da

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teck96 sarà eternamente grato.
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