i have a 2004 chevy trailblazer ls 4X4. I drove to work today and when i went to get out i turned the car off but couldnt get the key out. i tried to crank it again but it wouldnt do anything except turn power on to the car. the car was in park. About a month ago i had to have 2 weeks of work on my car looking for an electrical issue that would cause my car to kill batteries and completely go dead in a matter of hours. they said that it was a short fuse in the main fuse box that that was killing power. that was fixed and the transmission was replaced in september. it has been running fine until today. please help