Dell Inspiron 1720 (Mid 2007) - Manual (Page 24)

24
About Your Computer
DEVICE STATUS LIGHTS
The blue lights located to the right of the keyboard indicate the following:
Power light – Turns on when you turn on the computer, and blinks when
the computer is in a power management mode.
Hard drive activity light – Turns on when the computer reads or writes
data.
NOTICE:
To avoid loss of data, never turn off the computer while the
light is flashing.
Battery status light – Turns on steadily or blinks to indicate battery charge
status.
WiFi status light – Turns on when wireless networking is enabled. To
enable or disable wireless networking, use the wireless switch (see "wireless
switch" on page 27).