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(Reference) System Status Transitions and System Control Commands
DC OFF
DC ON
Not running
Ready
SW running
UP/PC
DN/DF
UP/PC/RS
DN/DP
(only trigger)
DF
RS
PC
Figure. System Status Transitions and System Control Commands
Note) When the UB command is used for system boot, the system always halts at the
EFI Shell screen. Operation cannot therefore be continued if the system is started
and stopped using, for example, the automatic power control feature, or rebooted
following error detection. If the system halts at the EFI Shell screen, the OS
cannot boot. Be sure to use the UP command to boot the OS. When you use the
UB command for changing the EFI settings, shut down the system and then
reboot it with the UP command.