what happens when you call www.your.url/board/index.php directly? not all servers have index.php in their DirectoryIndex listing. if you call that call up in your browser, and see the right things (ie: phpBB's installation screen), then you need to add an .htaccess file to the board's directory, with the following line:
DirectoryIndex index.php
that just tells the server to serve up index.php, if someone just asks for www.your.url/board/
as it's your machine, you can add that info directly into the httpd.conf
also, having php/mysql installed and running would be rather useful
