Database error

[wackyblackie]

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Have you read this?

Common MySQL Connection Errors

Many websites use MySQL databases to store information and settings. However, there are some reasons why the connection to the database may fail. This article describes some commonly seen error messages when connecting to a database, as well as some general tips to keep in mind when setting up a database connection. Common Error Messages Using MySQL is great, but the error message returned if there is an issue logging in to your database can be quite confusing. Here are some commonly seen error…

and made sure the credentials in the wp-config.php file are the correct ones for your database?

Also you may want to turn on WP-Debug. Here’s a guide:

Debugging in WordPress