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モデル番号A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5もしくは 3.4 GHz Core i7 Processor, ID iMac12,2

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2011 iMac only boots with SINGLE DIMM, only one memory slot at a time.

I think this guy: (Why does iMac boot up with just one memory in any slot?)

has the same problem that I have. I have a Mid 2011 2.7 i5 iMac that only boots with a single DIMM of memory. I have tried many combinations, the closest I could get it to boot was with 2 identical 8GB memory sticks in the two right hand memory slots. But otherwise, it just falls into an eternal boot loop. Logic Board? EFI? Board Firmware? If it’s unfixable, this is okay, I will have to settle for 8GB of ram for now (populated in the top, right hand memory slot).

the NEXT question is, I want to upgrade this Mac to the i7-2600 processor. If I can only use 8GB of ram, does that even make sense? I use photoshop and Lightroom to edit 16-30 megapixel still images (Canon/Fuji cameras), and 8GB is like… Okay at the moment, it gets by. OR should I just buy a functioning logic board with an i7 already in it, and possibly gain my functioning ram slots?

EDIT 4/8/20:

attached is a picture of the ram that I am using. I have two of the bottom one (timetec) , and one of them is still in the computer. I tried many combinations of the 2 8gbs and the one 2gb that I have, the previous owner was up front with the problem and told me that he had tried various 4gb/8Gb dimms that he was using functionally in his other 2011.

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Take out the SO-DIMM's, place them out into groups of the same brand and specs. Take a picture of what you have so we can see the labels and specs of the SO-DIMMs you have iFixitでの質問に画像を追加する方法

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done! See above for my picture, one of the two 8Gb dimms I have is still in the computer.

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RAM Type: PC3-10600 DDR3 Min. RAM Speed: 1333 MHz

Details: Supports 1333 MHz PC3-10600 DDR3 SO-DIMMs (204-pin).

Standard RAM: 4 GB Maximum RAM: 32 GB*

Details: By default, 4 GB of RAM is installed as two 2 GB SO-DIMM modules. Two slots free.

*Officially, this model supports four 4 GB modules -- one in each slot for a maximum of 16 GB of memory. However, third-parties have discovered that it actually will support 32 GB of memory using four 8 GB modules.

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Other than a size difference between the two sets I don’t see anything with the SO-DIMM’s to explain your problem.

You appear to have a bad logic board. The PCH and the support logic is located on the backside (visible metal heat sink)

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I would take the logic board out to inspect the back side to see if there is something visible that explains why the SO-DIMM’s are not recognized.

You talk about upgrading the CPU to a i7-2600, maybe its easier just to replace a complete logic board Vs trying to fix this one. Here’s one source 27” iMac Logic Board, 3.4GHz, Quad-Core i7, Apple P/N 661-5950

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Thanks for the response Dan. I looked at your link at it's pretty expensive to get hooked up with a full logic board. I mean, it's not like 8gb of RAM is the end of the world, I already own a newer macbook pro that I use for all of my work stuff (video/photo editing), the iMac is really supplementary. How much of a relative improvement do you think I could get from adding an i7 but sticking to only 8GB?

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@sloopjohnb - In my mind RAM is the more important aspect between the i5 Vs i7 you are mostly gaining hyper threading, so depending on your apps you may not gain that much Vs adding the RAM.

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I bought the computer for 200 CAD... it's not the end of the world if it's missing the mark. For me, it's acceptable with 8gb of ram, and I'd accept an incremental improvement if the i7 brought me that. I think I will start with the CPU upgrade and look at a logic board later on, but I don't want to spend too much money at the moment.

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sloopjohnb さん、ありがとうございました！
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