So, I had my 12 inch MacBook plugged into an external monitor (with Bluetooth keyboard and mouse) and was working on it normally, when suddenly everything became really slow and unresponsive, after waiting for a while for Force Quit to work and with nothing happening I decided to force shut-down the machine.

When it was starting up it asked me for a password after entering it the login screen froze after waiting for 5 min I force shutdown this as well.

But now the machine just won't turn on at all. What can I do?

  • If it won't turn on at all, there's really nothing you can do other than take it to Apple in for service. Just to clarify, when you say it won't turn on, it does nothing when you hit the power button; the screen stays black. – Allan Mar 14 '17 at 16:45
  • Yes dos nothing the screen is black – Lukas_T Mar 14 '17 at 16:56
  • 3
    Long shot: Reset the SMC (Different procedure depending on Mac Model) Hold Shift-Ctrl-Option-Pwr at the same time for 10 seconds while unplugged. Plug back in. If still dead, time for service. – Allan Mar 14 '17 at 17:14
  • When you reset the SMC, make sure to unplug every wired device, like a external display, USB drive, etc. BTW/ have you tried to restart with the external display detached? – IconDaemon Mar 14 '17 at 18:12
  • I had the exact same problem, under the exact same circumstances – resetting the SMC worked. – nzeltzer Aug 5 '17 at 17:16

I resolved the issue by doing an SMC reset.

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