iMac doesn't boot with four identical RAM plates
I have an iMac 5K 2019 where I’ve replaced the stock RAM with two plates 8GB (2666MHz) each (HyperX HX426S15IB2K2/16).
Today I bought two more identical modules and tried to install them. So now I have 4 identical modules. But my iMac didn’t start. I can only feel that warm air is coming from the iMac, but nothing more: the screen is black.
I’ve tried next configurations:
- It boots with any single module installed in any slot;
- It boots with any two modules installed in slots 1+3 or 2+4;
- But it doesn’t boot with any two modules installed in 1+2 or 3+4 slots;
- It also doesn’t boot with any thee modules installed in any thee slots
So I think, that modules are ok, and the slots are also ok. So what could be the problem?
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6 Комментариев
Are you able to get to the onboard diagnostics when you restart the system pressing the D key?
из Dan
I've tried but got no reaction. Black screen and nothing more.
из Evgenii Pliusnin
I’m having the same identical issue 4 x 8 GB HyperX modules each pair works in either bay pair and switching the module bay order. It just does not work with all 4 installed, called Apple and all they could advise is take it to the Apple Store for a check up
из paul_carroll
@paul_carroll - Sounds like you got the wrong RAM or they are defective. Try a another source.
Make sure you have the correct SO-DIMMs! 4 - 260-pin PC4-21300 (2666 MHz) DDR4
из Dan
I check on this website for compatibility. https://www.mrmemory.co.uk/memory-ram-up... And it says it compatible. So unless they have it wrong then pretty sure it should work.
из paul_carroll
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