I caused Mrs.E.'s new iMac to freeze up. I thought that wasn't possible.

I was trying to help her set up her email accounts. When we got to her
Comcast account, it would receive ok but would not send. Apparently
this is a common issue with the latest OS released by Apple and requires
some non-standard configuration changes.

Anyway, after several attempts to configure it, I decided to delete the
account completely and start over again. That's when it froze up.
Nothing worked when "clicked" upon. Shut the power off, and turned back
on. It returned to the same frozen status.

Finally found a "force quit" command. That worked.

But so much for the "bullet proof" reputation of a Mac.

(We are both still plowing our way through it ... not quite as
"intuitive" as claimed)