Connection to Database failed ... Access denied for user: 'myname@localhost' (Using password: YES)

This suggests you have something wrong with any of:
- username
- password
- database name
- database host/server
- security settings on your database

When you created your database, did you grant the user access to the database?

Proper database-configuration includes:
- make a database
- make a user, with password
- grant the user permission to use the database 
See this related article for tips: How do I create a MySQL database for Zen Cart?

Specific steps for creating and securing a database on "your" server can be obtained from your hosting company tech support.
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