Netra T1 AC200 problems booting into single user

I have a stack of Sun Netra T1 AC200's. I installed them all with Solaris 8 10/01 from my
Jumpstart server. I allready have about a hundred U1,U5 and U10's installed from this server so I know it should work. I have, however not installed any Netra's with it before.
My problem is that I have no problem booting the Netra's after I have installed them, but if you try to
boot into single user with fex. "boot -s" then it would display the usual "Type control-d to proceed with normal startup, or give root password for system maintenance". Problem is that no matter what I type, I don't get a reaction!!
I have everything on console, and I checked that all my connectors are correct and of the type specified in the Netra user manual.
Strange thing is that halting and jumping into the LOM works without problems, same goes for kicking the system down to single user from multiuser...
I've also checked with installing Solaris 8 04/01, but same thing happens there.. I can't have three faulty machines either...
All leads and helpful hints are welcome as I've checked and checked, but can't find anything out of the ordinary...
On beforehand thanks,
Thomas

What does "printenv input-device" show you? My thinking is that maybe LOM might have control at this point. It should probably be "keyboard" or "ttya".
Also check that root's shell is bin/sh in /etc/passwd.

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