The table below describes status light behavior for AirPort Extreme 802.11n Base Stations, Time Capsule, and AirPort Express. The AirPort Express status light does not glow blue.
Off
The device is unplugged.
Flashing green
The device is starting up.
If you choose Flash On Activity from the Status Light pop-up menu (on the Base Station pane of AirPort settings in AirPort Utility), the status light may flash green to indicate normal activity.
Solid green
The device is on and working properly. If you choose Flash On Activity from the Status Light pop-up menu (on the Base Station pane of AirPort settings in AirPort Utility), the status light may flash green to indicate normal activity.
Flashing amber
The device is reporting a problem. See below.
Solid amber
The device is completing its startup sequence.
Flashing amber and green
There may be a problem starting up. The device will restart and try again.
Solid blue
The device is ready to allow a wireless client to join the network.
For information about the reason the light flashes amber, open AirPort Utility, select your device, and then choose Manual Setup from the Base Station menu. Enter the password if necessary, and then click Base Station Status to display information about the flashing light.