Toshiba Satellite W30T-A - Manual (Page 44)

White Indicates the AC adaptor is connected and the
battery is fully charged.
No light Under any other conditions, the indicator does
not light.
If the battery pack becomes too hot while it is being charged, the charge
will stop and the DC IN/Battery indicator will go out. When the battery
pack's temperature falls to a normal range, charging will resume - this
process will occur regardless of whether the computer's power is on or off.
Power indicator
Check the Power indicator to determine the power status of the computer -
the following indicator conditions should be noted:
White Indicates power is being supplied to the
computer and the computer is turned on.
Blinking white Indicates that the computer is in Sleep Mode and
that there is sufficient power available (AC
adaptor or battery) to maintain this condition.
No light Under any other conditions, the indicator does
not light.
User's Manual 3-12