Turn on system using UPS power switch

[ajmichmac]

Is it possible to use a universal power supply (battery backup) to power up the mac without pushing the power button on the back of the display? IE, turn on the system when the UPS power is turned on...?

 

[drewsof07]

Not within MacOS, you'll need to use a third party solution to manage power up/shutdown behavior. I use Cyberpower PowerPanel with my CyberpowerUPS to manage Auto Startup to restore my server to operation automatically after a power outage when my Mac Pro shuts down. https://www.cyberpowersystems.com/product/software/powerpanel-for-mac/

 

[saulinpa]

Should do what you want by setting "Start up automatically after a power failure" in the Energy Saver preference pane. Works with my 5.1.

 

[crjackson2134]

Should do what you want by setting "Start up automatically after a power failure" in the Energy Saver preference pane. Works with my 5.1.

I think you’re suggesting omitting a normal controlled shutdown by simply cutting the power at the UPS, then letting the Mac detect a dirty power off, so that it will reboot when power returns. If that’s correct, it sounds like a bad idea to me.

 

[saulinpa]

I think you’re suggesting omitting a normal controlled shutdown by simply cutting the power at the UPS, then letting the Mac detect a dirty power off, so that it will reboot when power returns. If that’s correct, it sounds like a bad idea to me.

No. Do a clean shut down of your Mac. Then turn off the UPS. When you turn the UPS on your Mac will then boot up.

 

[ajmichmac]

Not within MacOS, you'll need to use a third party solution to manage power up/shutdown behavior. I use Cyberpower PowerPanel with my CyberpowerUPS to manage Auto Startup to restore my server to operation automatically after a power outage when my Mac Pro shuts down. https://www.cyberpowersystems.com/product/software/powerpanel-for-mac/View attachment 840287

Hmmm, I am using an APC BackUPS... seems they don't offer a Mac version of their power manager. Damn.
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No. Do a clean shut down of your Mac. Then turn off the UPS. When you turn the UPS on your Mac will then boot up.

I think you’re suggesting omitting a normal controlled shutdown by simply cutting the power at the UPS, then letting the Mac detect a dirty power off, so that it will reboot when power returns. If that’s correct, it sounds like a bad idea to me.

No, I shut down normally. It is the power up that I want to control with the UPS.
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Should do what you want by setting "Start up automatically after a power failure" in the Energy Saver preference pane. Works with my 5.1.

Does not work with my iMac Pro 2017... ratz...
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I think you’re suggesting omitting a normal controlled shutdown by simply cutting the power at the UPS, then letting the Mac detect a dirty power off, so that it will reboot when power returns. If that’s correct, it sounds like a bad idea to me.

As a test, I shut down normally but killed the UPS before the mac was completely shut down. THEN the UPS powers on the mac like I want. Since power cuts do happen (sans UPS), and presumably the OS is designed to handle them, can I assume there is no risk in stopping the shutdown before it is finished? FYI the boot took a bit longer than usual, possibly checking for corrupt files, but no error message was given and the system booted normally.