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Model A1419 / EMC 3070 / Mid 2017 / 3.4, 3.5 or 3.8 GHz Core i5 or 4.2 GHz Core i7 Kaby Lake Processor (ID iMac18,3) / Retina 5K display. Refer to the older iMac Intel 27" Retina 5K Display (Late 2014 & 2015) guides as the system is very similar.

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No display in Mac OS

I swapped out the mechanical hard drive in my iMac for an SDD, as the iMac was worse with the SSD (due to the 32gb NVME drive already installed for Fusion) I removed the SSD and put the mechanical drive back in. On doing so the iMac will now not display anything when booting off the hard drive, strangely enough though, it will display booting off the Bootcamp partition and an external drive with Windows 10 on it! So far I have tried....

A different display.

Re-creating the Fusion drive (wiping the mechanical drive in the process).

A different/new display cable.

Trying to boot off an external drive with Monterey installed on it.

SMC reset

PRAM reset

None of these things seem to kick the display back into life. I can get the Mac OS to work using an external display, but not the 5k display. As I've mentioned earlier, Windows works fine on the 5k internal display!!

Any suggestions please, as I don't think replacing the display will fix the issue (and is rather expensive to find out it doesn't!)?

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The drives partitions are getting you in trouble! You have two partitions the macOS and the BootCamp which is visible when you use a Windows OS drive.

What is confusing you is the macOS partition is not one drive! It's a marriage of two drives! With the newer macOS's you need both drives present to access the volume.

When you break the Fusion Drive set you can't gain access to the HD's macOS partitions data. To add to this Apple has altered things a bit so now so the blade SSD when present gets in the way when you replace the SATA drive as its expecting its partner to be present. Now we need to pull the blade SSD out.

Basically, you need to fully remove the Fusion Drive set (both drives) to either replace the SATA HDD or blade SSD!

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That's not the issue, I've wiped all the drives in the Mac and have re-set the Fusion drive(s) so that it only has Mac OS on it/them. The issue is that the display does not work when trying to boot into Mac OS. It works fine when booting into Windows 10 off an external drive.

I've put the original drives back into the iMac, so it now has the 32gb blade and the 1tb mechanical drive. The new SSD is set up with Windows 10 connected to the iMac via an external caddy.

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@JLB - Sadly Apple altered the systems firmware so the Fusion Drive's ID is set within it. I know its wacky! Between Catalina and Big Sur Apple did this!

A few people have been caught on this lately! I haven't don't any Fusion Dive conversions since Mojave days so it came as a shock to me too!

The Fusion ID sets the boot as you don't have a Fusion Drive present any more it just hangs. It makes no difference what you do with the SATA drive or even try to rebuild the Fusion Drive with a new HDD it won't work!

Switching out the HDD for a SSD is not an issue its the Blade SSD is still a remnant of the Fusion Drive. With its presence you can't make this work.

So how come Windows works! Thats because windows is using the Windows video driver within that OS to drive the display. So at least we know the display and the CPU & video services are woking!

This is tricky an Apple OS/firmware issue!

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Thanks for the reply Dan, so is trying to run Mac OS on the iMac now redundant? I've tried installing an older OS on the original drives, but that got me nowhere! Is there any way to re-install the firmware?

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@JLB - If you still have the original Fusion Drive blade SSD you can't get the replacement internal dive working no matter which one you go with HDD or SSD.

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Thanks, so the only option will be to physically take the 32gb blade out? I've tried wiping it and unmounting/disabling it, but no joy.

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Press and hold the power button for about 10 seconds. Press and release the power button, then immediately press and hold Command (⌘)-R until you see an Apple logo or other image. If you still see a blank screen after about 20 seconds, contact Apple Support

Regards,

Will

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That didn't work, I guess Apple Support will suggest taking it to a store to be repaired?

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