Wake the computer after it has gone to sleep.
APC BATTERY BACKUP SOFTWARE FOR MAC INSTALL
Probably because it's not needed at all, since OS X already includes all UPS monitoring and shutdown options required.Īnd I'd rather not install some unknown open source sw off the internet. It's obviosuly not the APC SW since it's not installed (OS X not supported - and why is that after all these years?) It's not causing the problem you describe. I have several APC UPSs including the model you are using, and with El Capitan's latest release. And don't say "Unplug it, then plug in after start up".
The whole point of having this UPS is to protect and be able to safely shut down the iMac (either manually or automatically). Why would OS X hang at startup from seeing APC UPS US connection? If this can't be resolved right away, I'll have to return it. So what's causing this OS X, APC UPS, or both? It's obviosuly not the APC SW since it's not installed (OS X not supported - and why is that after all these years?). I tried it another time to confirm and got the same result - hang at startup screen. And sure enough, once the USB cable was removed from iMac it started right up. I realized it must be the UPS USB connection since that was the only change/addition made to the iMac.
APC BATTERY BACKUP SOFTWARE FOR MAC MANUAL
I have to do a hard manual shutdown by holding down the power button for 5+ secs.
The progress bar gets to the middle and stops. It hangs at the startup screen (black background, Apple logo w/ progress bar). Everything seemed fine until I tried starting up my iMac after being shut down.
After that I connected the USB cable between them to bring up the System Preferences>Energy Saver>UPS settings tab/window and then set >Shutdown Options: "Shut down the computer when the UPS battery level is below: 25%. I just received the Back-UPS yesterday and plugged my iMac 27 into it last night.