With root priv's, you have to give yourself permissions to that host:
GRANT ALL PRIVILEGES ON . TO root@box1.myhost.com
would give the user 'root' connecting from server 'box1.myhost.com' all the privileges on every table on every database. Of course, you should hypothetically change things so that you only give out the needed permissions to each computer... but hey, I wouldn't mind restrictionless access to any db server 😉