Wish I could give you the answer, but just writing to let you know similar thing happened to me. I have Mac mini 2012, 4 GB. Same as you, I updated from to 10.13.2 and it's a disaster compared to other downloads I've made. My e-mail won't operate at all and I tried to sign into iCloud and my password was refused....when I was pretty sure I hadn't made a mistake. After trying it several times I got shut out; thanks so much Apple????? I am getting pretty ticked off. I've had a Mac since the beginning...back when Steve started out and he was always ethical and helpful. Now I'm starting to feel like this is evolving into Bill Gates' rubbish. That said, what should we do? I suppose I'm "lucky" I can get on the I/T, BUT I have stuff ordered, etc., and no access to e-mail. Not funny. I don't want to layer more problems into my computer. Should I change my password and if so, how do I do that? I have 3 answers recorded to answer security and it bombed out completely because it asked my date of birth (that's illegal, you know!) - anyway, it didn't work either, but I never remember putting in a dob. Other interesting fact, I transmit my Yahoo mail into my mac mail and now Yahoo doesn't give me direct access to my Yahoo mail. Yahoo is true rubbish, but I still want the ability to use the old email I have there. And why the heck would Yahoo not operate either - no graphics on the page for instance. I semi-apologize for being angry because people here are very helpful and I'm hoping someone can come to the rescue, please?
