So tonight I tried to install the latest OS from Apple. It was all going well until it asked for my password for keychain. It didn't accept my iCloud password or my computer password, so I pressed "cancel". Now it's stuck on the installation screen with "time remaining: less than a minute" as it has been for the last 40 minutes. I'll try upload the picture I took. Any ideas what to do?
You shouldn't worry, it's something every Mac user has, unless you're working on a Mac with an SSD.
You should not turn it off, because that will make stuff way worse (I already did that once, but knowing how stuff works, I was able to repair my iMac myself).
Now I've re-read your Post, and I see you're basically ****ed.