vtmac 0 Newbie Poster

Hi,
I'm new to mac and forums so feel free to correct me if I'm in the wrong place. I was given an iMac with os x 10.2.8 and I tried to set up a new user, it froze up and I log off. Now I have a screen with no desktop just a blue screen with white spirals. Any way to get back without the start up disk.
Thanks for any help

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