DB Connection no longer work after upgrading from VPS to Dedicated Server

[NiceWitIt]

Hi, I have a Web app running on a VPS host before and it worked perfectly fine but because of load and memory issues, I upgraded to dedicated hosting plan. However, after the upgrade my app no longer works because it does not let me make any type of DB connections. I keep getting:

Warning: mysql_connect() [function.mysql-connect]: Access denied for user 'myuser'@'localhost' (using password: NO) in /home/myuser/public_html/sitefolder/test.php on line 2
FALSE

The test.php file is a simple file containing this code:

<?php
$dbhost = 'localhost';
$dbuser = 'databaseusername';
$dbpass = 'databasepassword';

$conn = mysql_connect($dbhost, $dbuser, $dbpass) or die ('Error connecting to mysql');

$dbname = 'databasename';
mysql_select_db($dbname);
?>

Does anyone have any clue? I have not changed the files and everything was working fine before the switch to dedicated. I even had support reinstall PHP but still no dice. And we tried changing localhost to IP, etc. It keeps defaulting to 'myuser'@'localhost'

Any ideas?

Thanks, any help is greatly appreciated. 😕

[wilku]

Is it possible that you try to run different test.php? In what you showed the connection is attempted at line 6 and the error mentions line 2. Also errors says using password NO and the password in your example is set.
Can you connect to mysql from your system (command line tool) with a given username and password (maybe you didn't set the new user right)?