HP 310X - Manual (Page 152)

Is the Power/Status light ON solid
green?
for HP Jetdirect 175x external print server/Internet connector for USB
and HP Jetdirect 310x external print server/Internet connector for
USB
power/status light
power receptacle
Check the power/status light on your print server. It should be ON
solid green (bright green in color and glowing continuously, not
blinking). If it is not ON solid green, please follow the
troubleshooting steps below.
For all of the steps below, note that when you first apply power to a
normally operating print server, the power/status light will slowly
blink green for several seconds during self-test, and then go ON solid
green when the unit is ready for operation.
Check that the Jetdirect power module is plugged into a suitable
power source (typically a wall outlet), and that the power
connector is plugged into the print server.
Note: The power module shown below is the North American
version. The plug pattern may be different in other regions of
the world.
1.