Hmmmm.... sorry Dumo, apparently I'm not being clear bro, my bad.

By "removing or turning off AC power", I mean unplugging the power supply or turning off switch on back of PS or turning off AC power on a power/surge strip the AC cord of the power supply is plugged into. (the green standby LED in lower left of MB near diagnostic LEDs will go OFF)

By "using the on/off switch on the MB" I mean pressing and holding in the power switch in the lower right corner of the MB, near the SATA connectors. (the green standby LED in lower left of MB near diagnostic LEDs will stay ON... this does not remove AC power, only the main DC power to the MB... the +5VSB is still applied)

ygpm