Blank wp-admin screen after moving from XAMPP to live server

I’ve developed a fully functioning WordPress site using a XAMPP testing server on a Windows computer, and I’ve been trying to move the site to my new 1&1 server. After some struggling to configure the database correctly, I finally have the site itself (http://www.certainfaith.com) visible and working reasonably well.

The problem is, I can’t login to the wp-admin area. When I visit /wp-admin, I get the “White Screen of Death”. When I try a workaround and visit /wp-login instead, I can get the prompt for username and password, but the correct entries still bounce me back out and give me the “ERROR: Cookies are blocked or not supported by your browser. You must enable cookies to use WordPress.” screen. I’ve checked, and all my browsers have cookies enabled.

The site is installed in the root directory of the 1&1 server (“/”). I’ve checked for extra spaces in the wp-config.php and functions.php files (which some have suggested could be the problem), and nothing. I’ve followed the WordPress Codex for moving sites and just about any tutorial I can find, and still nothing.

I don’t know much about .htaccess files, but I’m wondering if the problem lies somewhere in there. Only problem is, the only .htaccess file I can find on the 1&1 server is in the “/logs” directory that was already created, and 1&1 does not allow access to delete or edit those files. Could that be the problem in any case?

Sorry for the long post. It’s been weeks of this, and I’m getting desperate to find an answer.