To Power Down the AS/400 iSeries, do the following:
Sign onto the system console with the QSECOFR user profile
End the Domino server if applicable (wrkdomsvr - option 6 to end - F5 to refresh and wait for *ended in status) - Also do option 9 to make sure all jobs have ended.
Make sure that all users have signed off the system (do a WRKSBSJOB QINTER - this screen should be empty.)
type ENDSBS *ALL *IMMED and press enter
type WRKSBS and press enter - press F5 to monitor this screen until all subsystems have ended except QCTL.
Wait for a few minutes and then do a DSPMSG QSYSOPR and press enter. Keep checking these messages until you see the message "System Ended to a Restricted Condition"
Type PWRDWNSYS *IMMED - press F4 - make sure the RESTART option is *NO.
**Note - to turn the AS/400 back on, press the white button on the front of the AS/400 one time. You will see codes scroll across the front panel within a minute from the time you press the button.