If it has Solaris 10 on it already, then boot it and check that the cdrom works while booted in Solaris 10.
If you don't have the access into Solaris 10, then at the ok prompt, you can use devalias to insure that the cdrom is known. Post your output from devalias.
I wasn't sure if you meant you tried the fsck command while at the ok prompt or while booted into Solaris 10. Please clear up this confusion on my part. Also, what were you trying to fsck?
Thank you very much. with the "devalias" command i found that my cdrom alias is not call cdrom. Thus I hv success install Solaris 9.
And for the fsck problem at t previous post.....means I using fsck command when i am logging in with the root user. I think is because some of the file in the /usr dir is corrupted thus i cannt use fsck. But now I have already over rite with Solaris 9........