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Modelli A1419 / Fine 2012 / Processori 2.9 & 3.2 GHz Core i5 o 3.4 GHz Core i7, ID iMac13,2

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iMac 27-inch, Late 2012- Problem with 3 b4 slots for RAM

Hello. My Imac (27-inch, Late 2012) has the original memory (2x4GB Elpida) in slots 1 and 2. When trying to install in slots 1+3, 1+4, 2+3, 2+4 it beeps three times and the Mac does not start. Replacing the original memory in slots 1+2 with new memory (2x8GB) is successful. Can not add memory to slots 3 and 4 (old memory or new). Please advise where to look for the problem.

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As you can see here your system can support 32GB!

But you need the correct SO-DIMMs

PC3-12800 1600 MHz DDR3L SDRAM (204-pin)

27” iMac "Core i5" 2.9GHz

27” iMac "Core i7" 3.4GHz

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If you have the correct RAM, then make sure the SO-DIMM’s are properly inserted and the contacts are clean.

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original memory installed in slots 1 + 2 or 1 or 2 works fine. If the original memory is installed in slots 1+3 or 1+4 or 2+3 or 2+4 or 3+4 or 3 or 4. Slots visually clean, slot 3 and 4 do not differ from 1 and 2. Maybe the problem is in slots 3 and 4 ?

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@Олег Б. - Then the RAM slot is damaged.

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Олег Б. sarà eternamente grato.
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