Here's what the screen said after the test:

(S.M.A.R.T.)ve)
100% Complete
(Quick) Pass
(Comprehensive) Pass
(S.M.A.R.T.) Pass
Hit any key to exit (I hit the space bar)

next screen:
Test Status #10000 Passed

asked if I wanted to save or edit Configuration; I chose Save.

Then it started up normally. We'll see what happens next time I have to restart. I'm not going to do it until it is requested!

Thanks everyone!