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?
Это хороший вопрос?
Are you able to get to the onboard diagnostics when you restart the system pressing the D key?
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
@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
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.
Показать 1 больше комментариев