Wait a minute or so and then reconnect it (or turn the PSU back on) and see if it powers up. Have the computer on/running and idle and then either switch the PSU off or remove the power cable. Note that some BIOSes don't actually work as intended due to bugs or PSU differences, so you should try this out yourself first. What this does is, regardless of whether the PC was on or off and regardless of what was going on when the power was disconnected, it will turn on whenever you connect the AC cord (or when you flip the switch on the PSU, if equipped). The only option that will turn the PC on in this case is the "Always On" (could also be called "Power On" as you indicate) option. Last State only works if the PC was actually on when it lost power, since it was shut down (and didn't actually lose power when it was running) that option won't power it back up if it was off (which it would be if the UPS shut it down) then it will stay off. It was simply shutdown by a process (in this case the UPS, but usually a user would do this manually). Since the PC was shut down by the UPS, power wasn't lost the way the PC sees it. "Always Off" and "Last State" won't work in this scenario, but "Always On" should work.
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