Did you change the password in the scripts connecting to this database? That's probably all it is.

Somewhere in the scripts you should find a configuration file. For most PHP scripts, it's (generally) a directory named conf or something, like

/my-message-board/conf/

and you'll find a config file in there. Variables are generally set like so:

$database_name = 'my_database';
$database_host = 'mysql.example.com'; // or 'localhost'
$database_user = 'my_database_user';
$database_password = 'ThI$isMyP@$$';

Other times, they will be defined as constants:

define('DB_NAME','my_database');
define('DB_HOST','mysql.example.com'); // or 'localhost'
define('DB_USER','my_database_user');
define('DB_PASS','ThI$isMyP@$$');

You just need to update the configuration for the program. As said the above is PHP, other languages will (should) have a similar setup.

Thank you very much, I was able to find a file called config_db.php on the ftp, and it has the old password:

<?php
session_start();
$conn=mysql_connect("00.00.00.000","USERNAME","OLD PASSWORD");
if($conn == true)
{
mysql_select_db("USERNAME",$conn);
}
else
{
echo "Unable to connect";
}

?>

Is this the only thing I need to change? Thanks again

Oh I changed the password from godaddy website > Hosting Panel not from any script, thank you