Garage door opener seems jammed
From personal experience, I suspect the logic board - but it's a nasty dice roll as the things are about half the cost of a new opener, and a new opener comes with a warranty, while a new logic board does not, and if I recall correctly was not returnable either, so if it does not solve the problem you're out that money. Mine had no visible damage.

In my case I was sure there had been a nearby lighting strike, and the opener did not stop altogether (so that's different from yours), but driving itself into the floor and not autoreversing were things it did after the event. Pay attention to the fact that these behaviors in an opener are things that kill people, particularly children (and pets) when counting the cost. 

Then again, if money is tight, consider disconnecting the opener (well, you have already done that) and just operating the door manually until money is less tight. When you do repair or replace the opener, make sure it has a surge suppressor on the outlet.