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NVME upgrade Issue (ssd does not show up)

Hi guys,

I got stuck with repairing my imac.

Here is a little chronology:

- iMac 27 "from 2017 quit working, restart using long press on start button. Crossed-out circle symbol

- after reseach I came to possible defect on SSD or the OS

- reinstalled (El Capitan) via online recovery mode (cmd + R), updated to Mojave and Time Machine

- ran stable for a few hours, then the same symbol again and no operation possible

—-> opened the imac (that’s the reason the repair shop doesn’t take it to repair)

- a Samsung 500GB is installed on the PCI port

- Samsung out, Gigabase adapter and ADATA SX8200 Pro 2 TB (with control screw) in, hard drive looks a bit too high, but goes in ...

- added a isolation tape to protect the adapter from electrical short

- does not recognize sdd, not even with "diskutil list "in terminal

- open again, SX8200 out, Samsung EVO 970 EVO 2 TB in

- does not recognize sdd again, in online restore mode

- old Samsung (the original ones, if the previous owner didn't do anything) back in without an adapter, it is recognized (I guess I did not broke anything either)

- testing comes to the same problem. Reinstallation starts, but ends with the crossed out circle. Does anyone have any ideas about why the 970 EVO is not recognized? Alternatively, I could install a normal ssd. Everything is cheaper than buying a MacBook pro m1 plus monitor.

Thank you and have a nice weekend.

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Sadly you’re fighting an issue with the adapter and M.2 SSD setup you are trying to use instead of the proper custom Apple SSD or the better 3rd party drives (OWC & Transcend).

I don’t recommend using these in iMac’s given the amount of work it takes to get to the port. I had to take out so many its not funny!

Yes! It does appear to work and some people get a few good months and then it craps out! If you are serious producer of content you can’t afford for your stuff to disappear! Then stick with the proper drives.

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Hey Dan,

Thx for the quick reply. So you'd recommend something like an owc aura pro x2? (plus a mx500 via sata)

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Yes the OWC Aura x2 blade SSD is what I would go with!

Now why are you also putting in a SATA SSD as well?

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@danj

As a backup and because I have it anyway.

What could cause the original problem with the samsung ssd and the crossed circle sign? Do I hopefully solve it by switching the ssd?

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@Frithjof Kjer - You'll need a HDD SATA cable to install it if your system didn't come with the HDD.

As far as the screen symbols give this a read: If your Mac doesn't start up all the way

Often it also shows up when the OS is corrupted!

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@danj As I reinstalled the os twice I guess / hope it is something with the original ssd. That I could maybe solve. I will see when the owc aura arrives. Otherwise I have to work on the mx500.

Any other possible issues that end up in the crossed circle sign?

Thanks a lot by the way.

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