A miracle cure

[naddy]

I just accidentally dropped my original HP-15C. Not from very high, so I didn't even think about it, but then it wouldn't turn on. Aww.

Let's jostle the batteries a bit.
Okay, it's on again. Phew.
Weird "0." display, though. I'll just run an ON/- reset.
That's better.
Just to be sure, let's run the ON/× self-test.
(... Wait, why is it showing "running" with a correct second "n"?...)
(... And didn't it just show 0.0000" with a complete fifth digit?? ...)
It's all there. All display segments are on. Including those two on the fifth digit that had been dead for many years.

I'm completely speechless.