MacBook Pro mid 2010 iOS update freezes at startup /Screen goes black after password entry then returns to Password entry screen

Thanks very much Axel- the Command-R keys got me out of the loop and allowed me to reinstall my backup via Time Machine and a print to install (again) High Sierra update! Not sure if I wanna try again as it took a full 24 hours ( I had the MacBook storage expanded/increased a couple years back) to reinstall what I had. I may just leave the ol’ workhorse as is , making use of the CD burner for tunes and use a MacBook Air I bought last year for majority of tasks/usage- just having the link you gave me kept this Cdn Senior (on a low fixed income) outa the Apple store- my last experience there wasn’t pleasant, they (mgr) seemed more interested in serving the masses with loose money that crowded the place than a longtime loyal Mac / Apple fan.

Since the reboot it won’t load my photo library (over 50k images) tho stored in iCloud) telling me my “applications are full” BUT I can access those through my other devices and, most importantly to me, my iTunes library downloaded and remains accessible. Thank you again- may you experience Good Karma as a result of your assistance Axel 🙏

Gary N / Alberta