OK - just to close the loop: Incorrect usage of mobile Joomla error message was fixed by the guidance here:
www.mobilejoomla.com/forum/topic.html?id=361
The Unable to connect with MySQL error message was started by me changing the database password in cPanel, without changing the website script. Once the error was there I was unable to log in to the administrator. The way to fix it was to download the configuration.php file, update the password, have godaddy make the file writable so I could upload it to the FTP client, and the error message was gone.
Thank you so much for your help! I was advised to restore the db for $150 and 10 days, which was not an option. And starting over neither... Being a beginner with joomla, I feel very happy now.