I was in the midst deleting trash file and the internet connection is becoming really slow. When I clicked the Products tab in the wp-admin it says that: "Error establishing a database connection", although I did not change anything on the database. Also, there are times that the message: "Access to the webpage was denied" is appearing. I've restarted several times, and tried copying and pasting the link in different browsers, but its still appearing and I wonder why. Hope you guys can get me out of this stuff. I think I'm gonna broke down into pieces now. :(
Try logging into FTP and making sure there is no .maintenance file, also erase the upgrade folder. Its never a good idea to stop wordpress during an automatic update. Take a look at your wp-config file to make sure everything appears correct, it could of been editing it and you cut it off half way.