override page-front.tpl.php with subtheme problems

I can't seem to override the page-front.tpl.php with my subtheme's page-front.tpl.php. I have tried deleting the main themes file but this does not make the subtheme's -front.tpl visible. I have followed the ardi procedure and created the folder page where i load the pages that need be overridden within the subtheme. I can override the other tpl pages but not the page-front.tpl.php.
Any suggestions, thanks