I was using my Micro the other day when all of a sudden the picture went away and the screen went blue. The lights are still shining brightly on the end of the head. What kind of warranty does this unit have? Does it sound like a problem with the head, or a problem with the screen? I guess if I had access to another head, I could screw it on to my screen and try it out, but I don't. Any advice? And why is there not a link to the manual on the Ridgid page for the Micro?