<power save [ input 1 ]>

hello
on my ultra 5 (under debian) obp since I activated an error saving mode display.
Since it starts and displays <power save [ input 1 ]>, then this is prologue to sleep for hours.
i can ejecting the cdrom works, I hear the fans ....
I have not access of OpenBoot (stop + a).
can i do an hard reset of OpenBoot?
how to find the display?

best regards
philo