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Model A1419 / EMC 2806 / Late 2014 or Mid 2015. 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (ID iMac15,1); EMC 2834 late 2015 / 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (iMac17,1) All with Retina 5K displays

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iMac won't power on after adding HDD. No LED lights up. What broke?

I carefully took apart a 27” Retina 5K iMac, following the iFixit guide, to replace the blade SSD and add a HDD. I discovered that I couldn’t replace the blade SSD with the M.2 drive I had bought, so for now I just added an HDD cable along with an HDD.

I put the computer back together, plug in power, and nothing happens. No startup chime, no fans, no backlight, no power through USB. After some quick research, I took off the display to check the diagnostic LEDs, and none of them are lit up. In case there was a loose connection somewhere, I took the computer apart and put it back together again, but I have gotten the same result. I did notice, however, that there is a buzzing noise coming from the power supply that can only be heard when the display is removed and my ear is close to the case.

Conventional wisdom seems to be that the power supply and/or logic board need to be replaced. However, I’ve seen some people wonder if the AC inlet is to blame, and I’ve seen at least one person claim they fixed this issue by removing the hard drive they had just installed. I am going to try that, but I don’t expect it to work.

How do I go about figuring out which components are to blame? I’d rather not shell out for every component if I don’t have to.

Thanks!

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Hi.

What type of hard drive have you installed?

I would take it apart again and put everything back to how it was before you put the new HDD in and check to see if it works then. If it does it may be a problem with the HDD that the computer is detecting.

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I installed a gently used Western Digital Blue that I had lying around that I planned to use as a large storage drive. I was confident it worked, but I tested it on a working Macbook Pro first using an external connection.

I took the iMac apart and removed the HDD and SATA cable, so everything is as it was before I took it apart. Still won't turn on, unfortunately. But the HDD is functional.

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Hi, did you get any results here?

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smphawk zal eeuwig dankbaar zijn.
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