IBM AA-RWF3A-TE - Manual (Page 95)

CAUTION:
Do not force the installation. If the power supply does not slide in easily,
make sure that it is oriented correctly before continuing.
8. Secure the power supply to the chassis by tightening the captive screw.
9. Plug the power cord into the power supply and then press the AC power switch
to turn it on.
10. Verify that the LED on the new power supply displays a steady green light while the
switch is operating (see Table 18 on page 93). If the LED is not green, make sure
that the power supply is firmly seated.
SAN Switch installation guide 95