Uploading a MySQL database

Hi,

I'm new to this PHP stuff so please excuse my question. I am running Advanced Guestbook 2.3.1 (PHP/MySQL) and I am trying to upload a .SQL file from my old guestbook. My server has Linux, Apache version 1.3.27 (Unix), PHP version 4.2.3 and MySQL version 4.0.12. I've gone into phpMyAdmin and exported the old structure and data. Then I have gone to the new database and attempted to upload the .SQL file that contains my old entries. The message I gets it's been successfully uploaded but when I go to the new guestbook homepage.....it's still blank. Any ideas? Please? I've been banging my head for hours on this!

Thank you all so much!

nadine