Need help with PHP / MySQL connect problem

Hi, I'm running MySQL 4.0.21, Apache 2.0.52 and PHP 5.0.2 on a Windows XP system. I can run scripts with PHP and HTML statements and see correct output in my browser. But when I try to connect to MySQL I get nothing, including no error messages. One book I have says to run the following scrip to test the connection. It should print either the Resource name or an error message: <?php echo mysql_connect ('localhost','calendar','pass1234'); # host, user, password ?> I get no output at all, and if the statement is placed in a larger script, above html/PHP output, it suppresses that as well. Using the mysql monitor from the DOS command prompt, I can connect as user 'calendar' with password 'pass1234', select a database and execute SQL statements successfully. Can anyone help me figure out why I can't seem to connect, please? Linda