Moving WordPress to a new server

I have a large blog 2.9.2 on my old server
I installed a new version 2.9.2 on a new server.
I backed up my blog on the old server in a .sql file
I imported the .sql file from the old server to the new wp database.
I copied ‘all’ the WordPress website folders and files from the old server to the new server.
I updated the wp-config.php on the new server with the proper settings.
When I run WordPress on the new server after importing the .sql file, and all the web files from the old server, WordPress begins a new install and wipes out all the posts in the newly imported wp-posts table.
What am I doing wrongly? Can you offer a step by step solution to migrate the data?