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A1418 / EMC 3069 / 2017 / 3.0 GHz quad-core i5, 3.4 GHz quad-core i5 또는 3.6 GHz quad-core i7 프로세서. 2017년 6월 8일 출시.

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Thunderbolt 3 ports stopped working after RAM & hard drive upgrade

After doing the upgrade my thunderbolt 3 ports stopped working. All other ports are working fine. Anyone know of any solutions?

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The same exact thing happened to me tonight. All aspects of my 2017 21.5 iMac are working fine, but my external monitor is no longer being recognized. No one seems to have a good answer for this, but resetting SMC or NVRAM do not seem to work at all.


Guess I just have to hook up my monitor on the USB 3.0 port.

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Hi, did you ever manage to get it working?

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Hi,

Did you ever get your ports working again?

I just did the ram on mine and thunderbolt no longer works for my display.

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@brannolte can you put your old RAM back to see if it’s definitely RAM issue ? If I am right you have to take out motherboard to upgrade RAM on this model, make sure that the motherboard is correctly back in place - if there will be 1-2mm gap there will be no connection for thunderbolt - USB is fine as it’s have longer connectors. If you can try connect thunderbolt when the motherboard is out, just to see if it’s really “gone” (but I am not sure what is your options).

@roboscrap

This is my wifes iMac so I've ordered another 2 sets of adheasive for the screen and will have to wait for that to come before i tear it apart again.

@brannolte OK just let us know :) (my advice - all time when I am ordering adhesive for iMac/iPad/iPhone I get 2-3 sets just in case if something goes wrong :) )

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