HELP - single user terminated, restarting

my 17 inch powerbook is about 2 years old, froze so I restarted it, the normal grey apple screen comes up & then switches to a black screen with this flashing text?
dyld: -sh undefined symbols: - environ
Oct 25 21:32:09 init: single user shell terminatd restarting
any help?

With "exit"

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