HP 310X - Manual (Page 5)

The power/status LED on the top front begins
blinking and within 15 seconds is solid green, to indicate
the server passed its self test.
❍
A solid green USB LED on the top front indicates a
good USB-II connection, as illustrated above.
❍
If your LEDs are not solid green, see interpreting the LEDs and
diagnosing problems
Verify the connection with the printer by printing a
configuration (test) page:
Briefly press and release the test button on the rear end of
the print server. The page should soon emerge from the
attached printer.
5.