Can't login as admin any more

Technical details at http://wordpress.pastebin.ca/2090520
My wordpress wp-login.php file is redirecting to
http://www.rnewton.net/wordpress/wp-admin/testcookie=1 and failing to access my admin panels. Error http 302 The requested resource resides temporarily under a different URL. I can access the blog as a viewer. Followed browser cache clearing and cookie deletions from this site but no change in error symptoms.