Serpentine belt will not Move

Car is Diesel. Yesterday I was driving my car and it started overheating. I pulled over and turned the car off and poured water into the coolant tank as I did not have coolant and needed to get home. Tried to restart the engine but the battery would not fully turn over the engine. I jumped the battery with a portable jump starter I have. The engine turned over, and temperature regulated, but then my car let out the loudest screech I ever heard! It lasted about 7 seconds then just stopped completely. I was 3 minutes from home and just wanted to get my car to a safe space so I drove it home. While driving the power steering was not working and car was very hard to steer. Found out that the serpentine belt completely snapped. Today I replaced the serpentine belt according to the correct diagram. Car started normally and sounded fine until I heard little squeaks and noticed smoke coming from under the hood with an electrical smell to it. Noticed the serpentine will not move before immediately turning off the car. Power steering still would not work.