$_POST array not being populated

Hi, I am new to the PHP world so don't give me too much grief if this has a simple solution. My problem is that the $_POST array is not being populated. I have created a form and the method of that form is "POST". I have started the session using session_start() but still nothing. When I try to display what is in the array using print_r($_POST) all I get is Array(). Did I screw up the PHP configuration? PLEASE HELP! This is driving me mad... Thanks Bennie Foreman