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Model A1419 / Late 2013 / 3.2 & 3.4 GHz Core i5 or 3.5 GHz Core i7 Processor, ID iMac14,2

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LED #1 blinking after adding a blade ssd

Hello guys,

today I put a blade ssd in and replaced the HD with a bigger one. Before this my iMac worked perfectly fine, and I can’t imagine the power supply being faulty.

Its an iMac late 2013 27” without preconfigured ssd

EDIT 1: Just realized I bought the wrong adapter. Now I want to know if my iMac supports pcie x4

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What did you put in? Give us the make and model


I put in a Toshiba hdd and a Samsung mzvlb256hahq-000l7


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1 Answer

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First the Samsung PM981 NVMe PCIe M.2 SSD (MZVLB256HAHQ) is not compatible with the custom Apple blade interface. Review this for more details The Ultimate Guide to Apple’s Proprietary SSDs

You’ll need to remove it and then you should be able to startup your system using just the Toshiba SATA HDD.

Update (07/17/2019)

If you are looking for performance than getting at least a 256 GB blade SSD is what I would get in addition with your HDD 256 GB Custom Samsung SSD. If you can you might want to get a 512 GB.

You’ll need to stick with the Apple Blade SSD if that’s the direction you want. Otherwise you could swap out your HDD for a SSD drive. This is the cheapest solution but then you need to consider where are you storing your data. Getting a larger SSD like a 1 or 2 TB iMac Intel 27" (Late 2012-Mid 2017) SSD Upgrade Bundle or looking at using an external USB Samsung T5 External SSD.

Frankly, I recommend the internal dual drive setup as the blade interface is so much faster than the SATA interface for your boot drive.

iMac Intel 27" (Late 2012-Mid 2017) SSD Upgrade Bundle Image


iMac Intel 27" (Late 2012-Mid 2017) SSD Upgrade Bundle


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Ok, so thankfully I can give my ssd back... I think I’ll just go for a used 12+16 proprietary sdd... Do you know a cost effective ssd-“setup”, no matter if it’s proprietary or not?


Also, is there a list of compatible M.2 SSD’s?

Ok, thanks, so I should stick with blade ssds (so no M.2 SSD’s) for compatibility reasons?


I have a draw full of dead M.2 SSD's and the adapter people have tried to make work. I don't recommend them and more so in an iMac given how much work it is to gain access to it.

Stick with the correct drive here. If you had a MacBook Pro then I would recommend going with either OWC or Transcend which both make direct plug in SSD that meet the specs of the system.

Look at it this way... Is a rope stronger that is un-cut and undamaged. Or, one that has a ton of cuts and knots? This is one of the issues with M.2 adapters.


Ok, thank you very much for your advice. It’s just that I don’t want to spend 100$ for a ssd, but I guess I’ll go with a 128 or 256 gb proprietary one..


I would go with the 256 GB as being the smarter purchase. I don't recommend using the smaller 128 GB as its just too small.


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