HP ProCurve 2520G-PoE Series Installation And Getting Started Manual page 13

Switch LEDs State
Test Off
(green/orange)
On green
Flashing
orange
1
The flashing behavior is an on/off cycle once every 0.8 seconds approximately, a fast flash.
2
The flashing behavior is an on/off cycle once every 1.6 seconds approximately, a slow flash.
Meaning
The normal operational state; the switch is not undergoing self test.
The switch self test and initialization are in progress after the switch has
been power cycled or reset. The switch is not operational until this LED
goes off. The Test LED also comes on briefly when you "hot swap" a mini-
GBIC into the switch; the mini-GBIC is tested when it is hot swapped.
A component of the switch has failed its self test. The switch Fault LED,
2
Test LED, and the failed component LED will flash simultaneously.
Introducing the Switch
Front of the Switch
1-5