Dell Latitude D530 (Early 2008) - Manual (Page 22)

22 About Your Computer
D I S PL A Y — For more information about your display, see "Using the Display" on
page 53.
D E VI CE S T A T U S L I G H T S
If the computer is connected to an electrical outlet, the light operates as follows:
1 display 2 device status lights
3 keyboard 4 touch pad
5 display latch 6 speaker
7 touch pad buttons 8 keyboard status lights
9 power button
Turns on when you turn on the computer and blinks when the computer is
in a power management mode.
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.
Turns on steadily or blinks to indicate battery charge status.