I can access mysql via the commandline but not through php. I dont' get any error messages, just a blank page. I put in echo lines to check where it breaks and looked at the source being output. It breaks right at the the mysql_connect command.

I am running Vista x64, IIS7, and PHP 5.2.4.

FYI, my php code is as follows:

<?php
echo 'test: Before Database Connection';
@mysql_connect("localhost", "username", "password");
echo 'test: CONNECTED!!!';
?>

You're not getting an error message because of the "@" symbol in front of mysql_connect.
Delete that symbol to see what the error is. It could be a misspelled username or password.

mysql_connect("localhost", "username", "password") or die ( 'mysql_not connected : '.mysql_error() );