Maybe the notification LED is the power switch itself. It means different things if the lamp in the switch is off, blinking or steady amber, blinking or steady blue.
http://support.dell.com/support/edoc...g/MT480A01.pdf
Quote:
Blue light — Blinking blue indicates that
the computer is in sleep state; solid blue
indicates power-on state.
Amber light — Blinking amber indicates a
problem with the system board. A solid
amber light when the system does not
boot indicates that the system board
cannot start initialization. This could be
an issue with the system board or power
supply (see "Power Problems" on
page 35).
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