Mac wont start after power failure

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After a power outage my Mac will not turn on. The fan is running but the screen will not turn on, it seems to be making a buzzing sound. What are the last four digits of your computers serial number.

Why is my Mac not turning on after power outage?

That will help us to properly identify your hardware. I tried resetting the PRAM and the power came on but I'm not getting a chime and nothing on the screen. My computer not turning on at all after a power outage , no sound no nothing, I unplowed it waited a bit and plugged it back a few times , but nothing happens!!

Any help appreciated. I get the Chimes and then the Apple symbol and the status bar and about halfway through the status I get a " panic cpu1 caller launch exited" message with a whole bunch of other information. Then it tries to restart itself. Anything else I can try before I have to take it in to be serviced?

2. Reset the SMC

May 24 by Pombo. If y -- our iMac is on, turn it off by holding the power button until the unit powers off. You should hear the fans go quiet. Keep these four keys pressed while the computer starts up.


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The three diagnostic LEDs 1, 2, and 3 are located below the battery and to the right of the memory slot. Note that the LEDs are marked 1, 2, 3 as show below.


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  • How I Fixed: iMac Won't Power On After Power Outage/Surge - Randy The Tech Professor;
  • An additional front bezel LED is located in an opening at the center of the right speaker. The LED will remain on even when the computer has been shut down or put to sleep. Let us know what you find.

    [5 Fixes] Mac Won't Boot or Start up After macOS Sierra Update () - EaseUS

    The buzzing could be coming from your power supply or your inverter. Try an external monitor and see if that shows you anything.

    How to Fix a Mac Laptop Stuck on a Boot Screen

    Thanks for the detailed explanation of the internal LED's. It filled in the gaps in what I have learned piecemeal from iFixit posts generally. Saved me lots of time and effort, god bless you. My Imac hasn't been turning on after a power surge from a blow-dryer.

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    However the imac was plugged into a surge bar. I have read numerous reviews of this happening to people and someone said they talked to a worker at an apple store and he said that your computer goes into a locked state anywhere from hours after.

    I just want to know if I should leave my computer unplugged or plugged in while I wait for it to decide when it wants to turn itself back on? Does this matter?! He and his family were traveling to visit relatives, but Paul planned to remotely use his Mac at home, via Back to My Mac for work and to stream Plex for the kids. As it states, with this option enabled, your Mac will restart itself automatically after power has been restored. One thing to note, however, is that this option only applies if your Mac was booted and running when the power outage occurred.

    These devices are like surge protectors on steroids , providing battery backup power and voltage regulation in addition to surge protection. If Paul had plugged his Mac and networking equipment into a UPS, he would have potentially enjoyed uninterrupted remote access. Not all UPS devices are the same, of course, and some offer much longer battery running time than others.