NEC Express5800/R120b-2 User Manual page 356

9-24 Upgrading Your Server
7.
Install the new power supply unit taking steps 3 to 7 of "Installation", and confirm that the
power supply unit is installed normally.
NOTE:
the AC POWER LED of the new power supply unit goes on amber until
the AC power cord is connected. It turns on green when the AC power
cord is connected. (If it is replaced while the power is off, the LED
flashes green. The LED goes on green when the power is turned on.)
If one of the two power supply units of the server is replaced,