Ga door naar hoofdinhoud

Repareer je spullen

Recht op reparatie

Winkel

A2115 / 2019 / Processors from 3.0 GHz 6-core i5, up to 3.6 GHz 8-core i9. Released March 19, 2019.

55 Vragen Bekijk alle

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?

Beantwoord deze vraag Dit probleem heb ik ook

Is dit een goede vraag?

Score 0

Commentaar:

Are you able to get to the onboard diagnostics when you restart the system pressing the D key?

door

I've tried but got no reaction. Black screen and nothing more.

door

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

door

@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

door

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.

door

1 commentaar meer tonen

Voeg een opmerking toe

OPEN ALLE TABBLADEN

RAM-upgradekits voor Mac

Koop kits

Genoeg RAM
voor al je tabbladen

Koop kits

2 Antwoorden

Het nuttigste antwoord

Give this a shot. Install all the RAM. Now we are going to zap the PRAM. Hit the power button and immediately hold down the par,option and command keys and hold them down. The machine should reboot. Continue holding down until it tones three times and release the keys and allow it to boot.

UPDATE 4/19/20

RAM Type:PC4-21300 DDR4Min. RAM Speed:2666 MHz

Details:Supports 2666 MHz PC4-21300 DDR4 SDRAM SO-DIMMs (260-pin).

Standard RAM:8 GBMaximum RAM:128 GB*

Details:*By default, 8 GB of RAM is installed as two 4 GB memory modules (and two slots are unoccupied). For some curious reason, Apple only permits this model to be configured at the time of purchase with 16 GB or 32 GB of RAM for an extra US$200 or US$600, respectively. However, as first determined by OWC, it actually can support up to 128 GB of RAM with four 32 GB memory modules.

At this point I would replace the original RAM and then attempt adding your new RAM. Also your new RAM may just not be compatible with this MAC. I would also contact Kingston and ask if the HyperX HX426S15IB2K2 is rated for this iMac.

Was dit antwoord nuttig?

Score 1

Commentaar:

Do you mean holding Command + Option + P + R?

I've tried it but got no reaction. Like if nothing happened. I only feel warm air blowing from the back of iMac, but nothing more. I've tried to press the keys before switching the mac and immediately after. I've waited for a minute holding the keys, but nothing had happened. No reboots, no apple logo, no beeps...

door

Let's make sure you are doing it correctly. here's a video on doing it:

https://www.youtube.com/watch?v=N5laIcLM...

door

Yes, I did it as in the video. Tried with a stock magic keyboard and with my USB keyboard.

And I also did SMC reset (actually, it's difficult not to do it when you install new RAM: if I understood correctly, the only thing II have to do is to unplug the power cord for 20 seconds, and I have to do this to open the RAM cover)

door

Voeg een opmerking toe

It does take a bit of time to boot when the system needs to validate the new RAM config.

Put the RAM back in make sure the RAM is fully seated. Restart the system, let it sit for a half hour the system should have booted by then.

If not take the original RAM out and put the new RAM in its place (slot for slot) did the system start up then?

Was dit antwoord nuttig?

Score 0

Commentaar:

I tried to leave it turned on with the black screen and new modules inside for an hour but it gave no result.

door

About the original RAM: I don't have it now. I only have 4 identical, non-original 8Gb modules.

door

Time to get another set from a known iMac RAM supplier ;-{

door

Voeg een opmerking toe

Voeg je antwoord toe

Evgenii Pliusnin zal eeuwig dankbaar zijn.
Weergavestatistieken:

Afgelopen 24 uren: 0

Afgelopen 7 dagen: 5

Afgelopen 30 dagen: 39

Altijd: 188