Headers Already Sent Problem

I have a site using a blog based on WordPress 1.5. I’m trying to move the site to another server. I copied all the files, modified the options data in the database, reloaded the database, changed the config files, etc. I started up the site. Everything seemed to work. I typed “siteurl.com/wordpress/wp-admin/” to login as administrator and I get loads of “header already sent” errors coming from the functions.php file, because is claims “wp-config.php” has already sent them. Any clue about what’s going on?

I use the same “siteurl.com/wordpress/wp-admin” to login at the old location and another blog at this location without problem. I guess I’ll have to try a fresh install but I didn’t want to do that because I’ve modified a few files to customize things.

Any clues as to what is causing this or why what I’ve tried won’t work.

Thanks,

PEB