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Seems your root password is not working.
Boot the system with CD to single user from PROM (ok).
From OK prom issue boot cdrom -s, the system will boot to single user mode.
Mount your root device, it will be something like /dev/dsk/c0t0d0s0, mount it to some mount point like /mnt or /a. (mount /dev/dsk/c0t0d0s0 /mnt)
remove the encrypted password for user root and save the file.
umount /mnt or /a where root partition is mounted.
reboot the system and re-set your root password using passwd command.