Advantech 5000 Series - Manual (Page 230)

Chapter 7
7.3 System Indicators
While the ADAM-5000 system is in operation the indicators on the
front can help you diagnose problems with the system. The table
below gives a quick reference of potential problems associated with
each status indicator.
POW Indicator
In general there are 3 reasons for the system power status LED (PWR)
to be OFF.
ADAM-5000 7-3