I would be backing up stuff NOW,
and set aside some time for a reload.
You will probably have to delete the partition and re-create it before you can format. (assuming you don’t have disk errors)
No kidding took me almost 10 hours to get my machine up after a complete dump 2 weeks ago after the cable guy came and upgraded me to cable modem I told him to just leave all the stuff and I would hook it up and get it going he said no he had to do it f uped my stuff but good