I just received my first American DJ product, the DJ Scan 250HP. To test it, I set it up in the stand alone mode by setting the first 9 DIP switches in the off position and DIP 10 in the On postion. I adjusted the sensitivity knob full clockwise and cranked up the music. When I apply power to the unit, the fan runs and the mirror moves to the right and keeps knocking against the stop for a short period of time; also, it does not move up and down. Not being familiar with this unit, I do not know where the head is supposed to stop, but assume it should be centered (?). I do not hear any other noise from inside the unit such as the gobo wheel moving. After the unit goes through this start up procedure, nothing happens, no head movement, gobo rotation sounds, light, etc. The fan does continue to run. Am I doing something wrong? Thanks in advance for any advice.