My day went from bad to worse. After the failure this morning, I worked on another machine and it went fine. Then when I powered up the third one to troubleshoot it, sparks shot out and it caught on fire. I had to use a fire extinguisher to put it out. This is not a common occurrence for me. I might have one of the two things that happened today occur maybe once every year or two. After two major failures, I decided to not work on anything the rest of the day.