I can't tell you the model because the client provided it, but one client's unit froze up OFF. When we got it fixed, we found that when power is removed, the two units have to be plugged in in a particular order or the system wouldn't power on. I hope that is in the list of tricks they tried.
A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
