It started and ran just fine multiple times yesterday...
I got ready to leave for work just now and it just turns over but won't start...
Had any one else's H3 just decided to not start? Have a fix?

 

Is your security light blinking? If it is, wait 10 minutes and try again. Do a search on H3 Passlock and you will likely find several reasons why this could happen. Happy hunting.

 

I was in a bit of a rush this morning and wasn't paying much attention to the dash, but now that you say that it might have been blinking.
Why would this happen all of a sudden?

Edit: Never mind...apparently the ignition switch likes to screw itself randomly...

 

Sure enough...it started right up when I went home for lunch.