Moving site from subfolder to root

Hello.

I want to move my wp site from a subfolder to my root and I tried following this guide:
http://codex.ww.wp.xz.cn/Moving_WordPress
“On Your Existing Server”

But when trying to access domain.com/wp-login.php after I change the url in general –> settings and moving the files to the root directory I only get a blank page – no 404 error or anything.

When I access the database the url has been changed in wp_options table…

What to do???