HP ProLiant SL4545 G7 Server - Manual (Page 20)

Component identification 20
Power supply LED
Power LED Status
Off • No AC power to power supply units. Check the AC power cord.
• AC is present. Standby output is on; output is disabled.
• Power supply failure (includes overvoltage and overtemperature)
Green AC is present and main 12 V output is enabled.
Fan LED
LED color System fan status
Off The fan is working or power is off.
Solid amber The fan module has failed.