Does the same thing happen when you boot from a CD?
The only disk check I can think of that's triggered at startup was not introduced until Mac OS 8.5, which I can't imagine you're running on an LC 550. If so, I think that might explain some weird behavior.
The only disk check I can think of that's triggered at startup was not introduced until Mac OS 8.5, which I can't imagine you're running on an LC 550. If so, I think that might explain some weird behavior.