/etc/passwd weirdness: HELP NEEDED!!!

[Wayne Ngai]

Yesterday, I put a "vi" job to the background on a RISC/os (system V unix)
system.  The terminal hung on me.   I kill off the vi and the shell processor.
Well, ever since after that, I can't login from that particular terminal.
It gives me the login prompt, but when I enter the user name, the system
tells me that "Sorry, can not find your password"  or something close to
that.
	Does anyone out there knows what's going on?  And{what went wrong?
And how should I fix it???  I'll take any suggestion!@!!!!


Thanks for all your help in advance!!

Wayne