The error you're seeing is typically the result of an issue with the database user name. I created a new user (in MySQL) to test it and then changed the setting in your CONFIG.PHP file for your Joomla installation, and then it started working. I then went BACK and put your original user in with the password you used and it failed again (even after I re-assigned it). The problem is most likely the password. I did not change the password for that user, since it appears to be used in several other databases. I would suggest double-checking the password and make sure it's right. You can also create a new user and then assign it to the Joomla database, then change the user name and password settings in the config.php file. Just remembeer that in order to edit your config.php file, you will need to change the permissions on the config.php file to 755 or 644 so that you can save your edit changes. When you finish making your changes, then you can change the file settings (for config.php) back to 444 for security issues.
Hope this helps! Let us know if any problems persist!
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This problem is ocorring now in my websites.. all sites! The server is slow too..
"Error displaying the error page: Application Instantiation Error"