Probably, but without seeing your code and site setup, we'll never know what.

Test your connection with a simple script, replace the "<CAPITAL_VARIABLES>" below with your own actual variables, see the results.

<?php
$username = "your_name";
$password = "your_password";
$hostname = "localhost";

//connection to the database
$dbhandle = mysql_connect($hostname, $username, $password)
or die("Unable to connect to MySQL");
echo "Connected to MySQL<br>";

//select a database to work with
$selected = mysql_select_db("<YOUR_DATABASE_NAME>",$dbhandle)
or die("Could not select <YOUR_DATABASE_NAME>");

//execute the SQL query and return records
$result = mysql_query("SELECT <ID>,<NAME> FROM <USERS>");

//fetch tha data from the database
while ($row = mysql_fetch_array($result)) {
echo "ID:".$row{'<ID>'}." Name:".$row{'<NAME>'}; //display the results

}
//close the connection
mysql_close($dbhandle);
?>

connection code must be clear
<?php
$servername = "localhost";
$username = "username";
$password = "password";

// Create connection
$conn = mysqli_connect($servername, $username, $password);
?>