I have (2) 12/2000 120v Mulitplus configured in parallel. I had turned off the mains and 12v supply today to do some work on the solar charge controllers, and now the slave unit will not turn on. It will also not be recognized by the MK3. The 3 lights flash and the red light illuminates if nothing is plugged in, but once a network cable is connected no lights illuminate and nothing happens. There is no clicking, no fuses have blown and I have 13.5 volts coming from the batteries. I also tried with 120v mains connected. I tried different ethernet cable. Please help; thank you.