IBM ThinkPad G40 Hardware Maintenance Manual page 50

Product overview
Indicator
2 Num lock
3 Caps lock
4 Drive in
use
5 Power on
6 Battery
status
7 Standby
status
46
ThinkPad G40
Meaning
Green: The numeric keypad on the keyboard
is enabled. To enable or disable the
keypad, press and hold the Shift key,
and press the NumLk (ScrLk) key.
Green: Caps Lock mode is enabled. To
enable or disable Caps Lock mode,
press the Caps Lock key.
Green: Data is being read from or written to
the hard disk drive or the diskette
drive. When this indicator is on, do
not put the computer into standby
mode or turn off the computer.
Note: Do not move the system while the green
drive-in-use light is on. Sudden physical shock
could cause drive errors.
Green: The computer is on and ready to use.
This indicator stays lit whenever the
computer is on and is not in standby
mode.
Green: The battery is in use and has enough
power. The ac adapter has charged
the battery completely.
Blinking green:
The battery is being charged, but still
has enough power to operate. (At
regular intervals, the indicator light
turns off briefly.)
Orange: The battery is being charged, but the
battery power is still low.
Blinking orange:
The battery needs to be charged.
When the indicator starts blinking
orange, the computer beeps three
times.
Green: The computer is in standby mode.
Blinking green:
The computer is entering standby
mode or hibernation mode, or is
resuming normal operation.