Mixture, sorry my last post contained a touch of frustration.
Ok, went into black screen. Got:
If you want to make modifications to files, run /sbin/fsck -y and then /sbin/mount -uw which I did.
I did your step 4 /sbin/SystemStarter
I then had the message: Waiting for Apple File Service about 25 times, followed by Startup complete.
Step 5 had no effect, just localhost:/ root#
Then did reboot, so no harm done. Any further thoughts on the password reset? As I stated, I have my original install disks which I purchased.
I wasn't expecting this detour from my original aim but perhaps it will make me careful with passwords and namings. Thank you for your patience!