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A1418 / EMC 2833 / Late 2015 / 3.1 GHz Core i5 or 3.3GHz Core i7 Processor. Released October 13, 2015.

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Black Screen and No External Video Output

My wife’s Late 2015 iMac had been working fine until 2 weeks ago when the display turned black while she was using it.

I have tried all the normal troubleshooting steps (reboot in safe mode, clear NVRAM, clear CMOS (hold power button for 10 seconds with power cord unplugged), reboot in recovery mode, etc.). Apple Support walked me through all their steps, then suggested I take the computer in for repair.

A few months ago, I replaced the OEM Fusion Drive (why did Apple think these were a good idea?) with an OWC SSD, so I felt relatively comfortable opening the computer up to take a look to determine if there was anything I could diagnose.

On startup, all four diagnostic LEDs light up, and the display backlights appear to be working. Internet sluething suggested the issue was with the display or display cable, so I ordered and replaced the display cable from the motherboard to the display.

Now when the iMac starts up, it has a black screen, all diagnostic LEDs light up, but if I wait around an hour the “Question Mark Folder” appears. Since I’ve not had a Mac with “missing” system files impact the display before, I reseated the SSD I’d added, but nothing has changed (black screen on startup, all green LEDs, and Question Mark Folder after an extended period of time has ellapsed).

I’d appreciate any advice or guidance people might have. My remaining thoughts are to swap the SSD out with a drive I know is working, replace the display panel assembly, or both. Since replacing the display assembly would cost about half as much as a new Mac, I’m hesitant to do so. Am I wasting my time and effort to keep this computer running?

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I'm confused ??

Are you getting an image on the internal display right now? Are you getting an image on your external display right now?

If you are getting a blinking Question Mark in a folder that's telling me you have drive issues. Which is either because the drive has failed or become disconnected which holds your system files.

Which drive did you replace did you swap out the SATA HDD or did you swap out the PCIe blade SSD?

Do you have a good power surge suppressor or better yet a UPS? A power surge/lightening strike could have done you in!

da

An image is displayed on the internal display, but only after a significant delay (1 hr+). I've had no luck getting an image on an external monitor.

I understand what the blinking Question Mark folder communicates, but that doesn't have anything to do with the display as far as I know, so that's a separate issue. But as I mentioned, I reseated the SSD (disconnected the SATA/power cable and reconnected it). I'll install a different drive and see if system folder contents magically makes the display work.

This computer does not have a PCIe blade SSD - it shipped with a Fusion Drive. I removed the Fusion Drive (HDD) with an OWC SSD (2.5").

The compuer was plugged into a power strip with surge protection, and we had a whole house surge protector. There were no electrical storms in the area when the issue began.

da

@thellamahunter - Let me clarify, A Fusion drive is two physical drives seen at one logical drive. So the HDD you replaced with a SSD is only one part of the drive set! The other is the hidden blade SSD on the backside of the logic board. It's the other half of the fusion set!

I fear your issue maybe related to it, as it still being present as it wants to be part of its mate which is now removed.

da

@Dan - Interesting. Would the computer have worked normally for over a month after replacing the HDD with an SSD? Would that have impacted the display?

Also, why doesn't the ifixit guide to replacing the HDD in a late 2015 iMac mention the blade SSD?

da

Remember your system came in three configs HDD alone, SSD alone or a Fusion Drive (both present). The guides don't deal with the OS level aspects of a Fusion Drive just the physical drive hardware.

da

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Soluzione Prescelta

At this point you’ll need to setup an external bootable drive from a working Mac with the same OS version your iMac is using.

Then using the Option (⌥) when you restart your system to gain access to the Startup Manager to then select it to boot up your system. This should allow you to then backup anything you need to and then using disk utility delete the PCI SSD drive.

Reference: Mac startup key combinations

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