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Hi, I'm having serious troubles to figure out what's wrong with a mid-2012 13" MBP.

Basically upon turning it on, it shuts down a bit short after the progress bar with the apple logo appears. Pls refer to this video:


I've tried all this and always see the same behaviour:
  • Resetting PRAM & SMC
  • Swapping RAM with that of another working Macbook
  • Swaping the hard drive with that of another working laptop
  • Booting in safe mode (command S)
  • Booting with a USB drive with a bootable image of OS Sierra

I ran the onboard diagnostics (command D) and came up with no hardware errors.

I don't know what else to try.

Input greatly appreciated...