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Announced on October 16, 2014, identifiable by the model number A1347 and EMC 2840.

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Mini powers off during boot

Hello!

Backstory: I purchased a late 2014 Mini about a year ago and attempted to setup bootcamp with Windows 10.

Following numerous failed attempts I made an appointment with a genius bar. After several more attempts by three different geniuses over the span of 3-4 hours, they were finally able to get Windows installed.

Flash forward a couple of months and Windows pushes out one of its big cumulative updates. I try to install the big update and it errors out over, and over, and over.

After scouring Google for days and trying a variety of suggestions I decided to throw in the towel and give up on bootcamp altogether.

But, somehow during the process of removing the Windows partition, I also managed to destroy the macOS partition along with the recovery partition. (yes, I am an idiot). Feeling extremely frustrated, I stuck the mini on a shelf and moved on with life.

Flash forward to today. I removed the Mini’s hard drive, hooked it up to my iMac, and reinstalled macOS. Put the hard drive back into the Mini, fired it up, and … it won't boot!

The LED comes on, I hear the startup chime, but my display remains black. Then, after 20-30 seconds the Mini powers itself off.

Any ideas of where I should start? What is the most likely thing I screwed up?

Thanks!

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What is the MacOS version you are running on the iMac you used to install the OS on your Mini's HDD, and what was the OS version it had beforehand.

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The iMac is running Mojave. I can't remember what the Mini had originally, but I installed High Sierra on the Mini's HDD.

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You’ll need to set a bootable OS installer USB thumb drive so you can properly update your Mac mini. Here’s how: How to create a bootable macOS Mojave installer drive

You have two issues the first is your iMac updated the drive to APFS on you, yet your Mini has no knowledge how to boot up under it as the systems firmware was not updated. Upgrading the system from your installer drive should fix things.

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I created the bootable installer. However, I am unable to boot to the USB installer via the mini because I still can't get any output to the display. Just a black screen after the chime.

So, I connected the hard drive to my iMac again and reformatted it back to HFS+. Then put the drive back into the mini, powered it on, but still get the startup chime and then a black screen for about 30 seconds before it shuts itself down.

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Have you tried screen sharing? Screen Share to Another Mac's Desktop

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Dan,

I followed the steps in that article but wasn't able to make a connection for screen sharing.

One thing I noticed though is if I attempt to start Internet Recovery by holding Option-Command-R the mini still doesn't display any output, but it continues running without shutting down...

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Then your logic board is bad as being able to do a remote connection would have bypassed the GPU logic all together.

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I think somewhere down the line you may have damaged your SMC. Does the mac mini display on any of the other output devices like HDMI or Thunderbolt?

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The mini has two Thunderbolt ports. I have tried both ports with two different monitors that I know are good. It also has an HDMI port but I don't have a monitor with HDMI capability right now.

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I would probably try to source a replacement board. That might be your best bet in this situation.

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That's what I was afraid of. Had originally ordered it with 16 GB memory so that's going to be pricey.

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Tyler Smith 将永远感激不已
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