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Hello,
I have a Retina 5k 27 inch 2017 imac
Processor 3.5 GHz Quad-Core Intel
Core i5
Graphics Radeon Pro 575 4 GB
Memory 64 GB 2400 MHz DDR4
We had a power cut and it will now not turn on. I have tried all the options I can find online.
This has happened before and turned on after about 3 hours of trying everything.
Please help.
iMac 27″ 5K, 13.3
Yesterday, I attempted the suggested solution without success. However, today I decided to disconnect the power cable from both the iMac and the power socket and left it unplugged for the entire day. Then, I plugged the power socket back into the wall, held down the power button for 15 seconds, connected the power cable to the iMac, and to my astonishment, it turned on when I pressed the power button! It seems like some sort of magical fix. Any idea why this has taken so long to reset?
Have a look at > If your Mac doesn't turn on - Apple Support
Reset the SMC, as per > Reset the SMC of your Mac - Apple Support
Then if your Mac still does not turn on > contact Apple Support.
Sometimes an older iMac or desktop model may need the 'clock battery'
replaced, in order to restart correctly and run. Some of those computers
have a smaller panel to gain access to the battery; so check for that..
Other times the battery could be located on a 'logic board' deep within.
[Such as the original Mac Mini G4 and similar intel-based Mac; the entire
bottom comes off, after some fuss. Later ones still require some effort.]
Mac Repair & Service - Apple Support
//support.apple.com/mac/repair
However that might only be 'a first step' in path to troubleshoot a device.
Perhaps a failed power supply may be the cause of this issue. Genius
or authorized Apple service provider could check & test for the cause.
Only by opening it up & pulling it out...
https://eshop.macsales.com/installvideos/imac_27in5k_14late_hdd/iMac17-1/
Guess what. I was sorting out my studio and plugged in the iMac for one final check and it turned on over a month later!
Try this...
1.. Shut the machine down.
2.. UNPLUG the power lead to the computer and any peripheral devices.
3.. leave it for 10 minutes.
4.. Hold power Button in for 10 seconds
5.. Connect everything back up and restart.
If it shuts down again or you can't boot up unless you do what you did earlier it's a failing power supply. Had a similar issue with a 2014 iMac.
Have you tried removing the power cord from the back of the iMac for about 15 second, replacing it and trying the power button again?
Thank you - I have tried this a number of times and had no luck
Thank you - The PRAM battery is located on the back side of the logic board, so replacing it requires first removing the logic board.
I will look into this
unless the computer has been extended storage (3+ months or more) your PRAM battery is just fine!
also opening an iMac is very difficult and once inside working on them is tough.
Many Thanks
Guess what the same thing happened again - I shut down my machine and the electrician cut the power. The power is back on but my machine will not turn on. Any ideas? Maybe I have to wait 24 hours?
I have tried that but nothing happens
I'm afraid it's dead then.:(
iMac will not turn on
