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

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Mac Mini Late 2014 Won't Boot

My Mac Mini (2014, fusion drive) started to constantly freeze and require hard restarts. Soon after it started having boot problems too. I don’t remember the specifics of what would happen at boot, but ultimately I was only able to boot into safe mode a single time. I haven’t been able to get it to boot since.

Currently it powers on (front led turns on), chime sounds, external monitor turns on but screen is blank.

Powers on to blank screen.

Responds to command to reset PRAM (more chimes), but doesn’t help.

Fan works and appears to run normally while device is on.

I replaced the HD (main SATA portion of fusion only). Probably should have checked here first as it didn’t help or change symptoms in any way. Side note, I was unable to access the old HD with my other mac…it didn’t even register that there was a drive connected when using the device I used to format and install MacOS on the new HD. I was expecting either the new drive to fix the problem or to be able to easily retrieve my data off the old drive. Super annoying.

One final note, my external keyboard lights up on power up and I can get the caps lock light to toggle on/off for the first few seconds (during and immediately after chime). After that point, power appears to get cut to the device. Also, plugging in a monitor after that point results in nothing happening...the monitor doesn’t detect there is even a device connected at that point. The front led and fan continue to stay on until I force turn off the device by holding down the power button.

Any advice would be greatly appreciated! Thanks!

EDIT: I have tried all startup key combinations with no result. Option-Command-P-R (NVRAM/PRAM reset) was the only combination that the machine appeared to respond to, but it ultimately had no effect. I have verified that the monitor and monitor cable work with another computer. Besides the initial startup chime, the device makes no other beeps or noises.

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What happens when you boot up in Target Disk Mode? Hold the T key when you restart your system. Do you see the Thunderbolt Icon on the screen?

Reference: Mac startup key combinations

Update (11/07/2018)

Sadly your logic board has failed (CPU) there is nothing you can really do to fix this other than replace the logic board. Here’s the IFIXIT guide to take it out Mac mini Late 2014 Logic Board Replacement and here is one source for the replacement logic board: UK TheBookYard - 2014 Mac Mini logic boards Find yours from the listing to then locate the Apple P/N then see if you can locate the logic board where you live.

Depending on the model you might consider jumping to the just released Mac Mini. Unlike yours the new model has serviceable RAM so you can upgrade it to what you want at anytime. You won’t be able to reuse the SSD or HHD drives and the new model has a soldered flash drive so you’ll want to look for an external cases to house your drives.

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Nothing happens. No Thunderbolt Icon.

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any corrosion on motherboard? In what humidify it was used?

How it was used? (I talk about CPU/GPU usage)

They do not die just like that - HAD TO BE REASON.

Power on Mac without any drives - and WITOUT ANYTHING in USB - just video cable and power cord only!

Tall me about those beeps - as they mean something - like 3 long 1 short etc.

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I've seen a few have this failure.

This model only has the intergraded graphics services within the CPU module, which is what failed here.

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Mike 将永远感激不已
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