SAA locked up

[reno]

I took one of my SAA apart and cleaned it and put it back together, and cocked it a few times and it locked up. I have one screw I can't get out right now on the front trigger guard and cannot take it apart to fit it. Does anyone have an idea why it locked up?
Thanks
Reno

[Coffinmaker]

  IT  DOESN'T   LIKE   YOU   

Without taking it apart to look at, I got no clue   

[Abilene]

Locked up how?  Hammer down all the way but won't pull back at all?  That could be a broken bolt leg.

[reno]

Abiline, that is about what happened. I thought it might be the bolt , hand, or maybe the bolt spring, and won't know till I get it apart. I gave up on the screw and took it to an old gunsmith I used to know and he said he would try to get it out for me.
Thanks for all responses.
Reno