Apple mac mini power supply2/9/2023 Updated -I booted the aforementioned iMac from an external Yosemite boot drive and it displays the same behavior as the Mac Mini. I tried booting from an external drive that has OS 10.8.5 on it, but the Mini would not let me do this. I also tried triggering a shutdown by "haltlevel" 100 (shutdown when battery dips below 100%) and the machine is still not shutting down. Updated -I have verified in Terminal that "haltafter" is on and set to 1. I also tested with a Furman F1500-UPS in place of the CyberPower unit and there has been no change in the behavior. Today I installed OS 10.10.1 update and tested again with the same results. Updated to add: I tested with the CyberPower 825VA and the Mac Mini running OS 10.10.0. I have tested this with an iMac running Mavericks (10.9.5) and the UPS behaves as expected, but on the Mac Mini running Yosemite the computer does not shut down and just continues to run off the battery. Our UPS is set to shut down the computer after running on battery backup for 1 minute. We just received a brand new Mac Mini, which came with Yosemite pre-installed.
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