The model Apple portable you have appears to be one build in 2005 and for details
in how to start up from the single-user mode or other details, you'd have to state
what you have, and what you did. Also why you were trying to perform this action..
And if you still have the system software restore install DVD media it shipped with.
Or the last supported OS X version on DVD for the PowerPC processor series...
that would be the Leopard OS X 10.5 retail DVD; to use it as startup disc to test
the hard drive, and perhaps reset or restore a system.
Details about your computer, when it was made, etc are in a Lookup by Serial Number
https://www.powerbookmedic.com/identify-mac-serial.php
The number you posted appears to be this model...
...perhaps a Host will move your posts to a new discussions area separate from earlier content.
Were you trying to start in single user mode, or just get the computer to take a new admin user password?
If you had the correct install-restore media (original grey label DVD that came with PBk, or retail 10.5)
the proper method would be to start the computer with the DVD in the optical drive, and hold the C key
until it loads, then select from the menu items in the Installer, until you see Reset Password; in OS X 10.5
retail media, not gray label from a specific computer, you'd never need to use terminal or single-user.
There may have been an error in your attempt if you made a mistake in the typing; so if you had a
correct line to enter in single-user mode, or copy-pasted the right one, the command may be OK.
http://www.gizmobeast.com/how-tos/macbook-password-resetting-without-cd.html
or this
http://www.macosxtips.co.uk/index_files/reset-lost-os-x-account-password.php
Good luck...! 😐