IMac powers down while starting in safe boot mode

My 2014 21" iMac powers itself down after about 10 seconds while trying to startup in safe boot mode. I'm not even sure why it is trying to start in safe boot mode. I shut it down after a power outage while plugged into an APS UPS. I'm guessing that since I interrupted the auto shutdown it is restarting in safe boot mode. Either way, I get a grey screen with a big apple and a progress bar. The progress bar gets to about a tenth full and the power just shuts off.
I've tried starting up while holding the alt key to select the Macintosh HD. The same thing happens.
I'm not particularly tech savvy. Any ideas are appreciated.

Thank you for the clarification and link. I ran the disk utility on Macintosh HD and it said it can't repair the disk, and that I need to reformat and restore. It has an invalid node structure. All of this happened just because I shut it down presumable while it was already trying to shut itself down after talking to the UPS?
At least I use Time Machine.
Thank you again.

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