Changed Domain: Now unable to access login

Hi there!

Hope you can help!

The scenario:

I had a blog installed on a hosting account at domain1.com/blog
I decided I wanted to change the primary domain name associated with my hosting account. So, I changed that to domain2.com and removed domain1.com’s association with that hosting account.

After I did this, I updated the siteurl in my database to the new url: domain2.com/blog

I am able to access the index page when I visit domain2.com (I have the index in the root, but the blog, as mentioned, is in its own sub dir). However, nothing else on the site works. I cannot log into my wordpress installation or even get to the login page via: domain2.com/blog/wp-login

However, I can get to the wordpress login page by going to what is the old domain url: domain1.com/blog/wp-login If I try to login at this page I get a bunch of errors that read like the following:

Warning: Cannot modify header information – headers already sent by (output started at /home/content/i/n/d/username/html/blog/wp-content/themes/themename/functions.php

Any ideas on how to rectify this installation? Or must I delete it all and start again? I’m thinking there’s something else that I have to change in some file… to the new domain name.

Thanks for your help!