Okay I'm in the stout mines and I talked with the Stout King, and then I killed him. I looted the vaults...and got the dragon armor. Well now I'm at the mine carts...I've clicked on the cart and it says "All Aboard", but when I hit the lever it says "lever doesn't work"....what do I need to do? Did I make a mistake by killing the King?

There are two carts, one that works and one that you need to fix. You should be able to find an iron bar or whatever it is near where the left cart takes you in the mines. Hope that helps since I didn't kill the king and have no idea how that affects the game.
Wyv

That's just it I tried pulling the lever to make the car work and it won't. I'm trying to get the cart to the left. That is the one that won't work for me.