iMac 21” (EMC: 2638)

The iMac was connected to a UPS but through an extension cable, so not directly.

So the iMac was running as usual when suddenly it went off, with all the other devices that are connected to the UPS. And I have no electricity in the room, the electricity breaker tripped, and the UPS is making that loud beep.

After unplugging everything from UPS, and turning back electricity and etc... I found out that it was caused by the iMac.

(UPS and all other devices are working fine now without the iMac there).

I try to plug the iMac to a different socket, but it immediately trips the breaker even before clicking the power button, just by plugging the cable to the socket, trips breaker!!

I tried different sockets in different rooms that are connected to a different electricity breaker, but the same thing happen.

I tried a different cable, but same thing happen.

I unplugged cable from the back of the iMac and tried the 10-sec hold power button thing, but didn’t help, same thing happened.

TL;DR - iMac is tripping breaker just by plugging it to electricity, without even pushing the power button!!!

Any one has any idea what happened here??

the closest Apple service center is hours far from me and I would really want to try everything before going there.

Thank you!

  • No idea what happened, it is strange, but obviously a hardware issue. I would not plug it into ANYTHING again and take it in for service. Apr 19, 2019 at 0:13
  • There’s a short to ground in the power supply. Dont plug it in anymore and take it in for service
    – Allan
    Apr 19, 2019 at 0:16
  • Take it to a good apple tech - and please say you have a backup...
    – Solar Mike
    Apr 19, 2019 at 2:49
  • no I have no backup, is there a tool kit from ifixit or something like that, to open it up and backup the data?
    – What123
    Apr 19, 2019 at 15:16
  • You shouldn’t be considering backups AFTER a problem has occurred. Apr 26, 2019 at 15:33

1 Answer 1


DANGER! DANGER WILL ROBINSON! Don't try to plug it in. That sounds like a hard short. Get it to an Apple Store or an authorized repair center. Hopefully, it's under AppleCare or some type of warranty. Each time you try to plug it in you risk doing irreparable damage to the iMac or, worse, possibly causing a fire or life-threatening shock hazard.

  • 1
    The OP shows "iMac 21” (EMC: 2638)" and an EMC of that number is a Late 2013 iMac, so doubtful it's under any warranty. However, the warning and what to do is right on target! +1 Apr 19, 2019 at 1:17

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