I am a webhost, and I have moved a customers site to a new server. When tested with site preview it seemed to be working fine, but it turns out that was because his index file had a redirect in it to his old site.
Now when you go to his site, you get this:
Error establishing a database connection! This probably means that the connection information in your wp-config.php file is incorrect. Double check it and try again.
I have checked it - and even changed it - several times, but to no avail. Is there any particular thing cPanel might have done wrong when moving he site?