/usr corrupt, can get to fsck (solaris)

I have a solaris 5.8 system, it wont boot because /usr is corrupt, which means i cannot bring up fsck to run a disk check. Any ideas?

You should have a statically linked fsck in /sbin. Can you access /?

i can get access to /,/sbin,/etc but none of these contain fsck in solaris 5.8. I have tried a mount command (mount is in /sbin) with "mount -o ro /usr" but that fails too....

Frank

Please boot from cdrom
At the OK Prompt:

boot cdrom -s # for singel user mode at cdrom

There you can use the fsck command.

best regards joerg