I think some more information is needed here.

First, just to verify:
1) you have 2 "full" units and "several" standard units
2) the 2 "full" units have dowloaded the blockchain and are running as nodes
3) None of the units, full or standard are mining
4) You're using the supplied PSUs or have one or more PSUs supplying at least 250 watts per unit (80% rule)

If all that is correct, then the first thing I'd try is to simplify everything:
1) shut everything down using the web interface, then disconnect everything
2) select one of the full units and connect it to internet and power
3) Turn on the selected full unit
4) Describe the selected unit's behavior as it powers on including the "main" LED and the colored ones inside the unit. There's a description of what should happen way back at the top of this thread.