Magento – SQLSTATE[28000] [1045] Access denied for user ‘balmain’@’localhost’ (using password: YES)

databasemagento-1.9magento-connectsql

I'm attempting to connect on my site in magento 1.9 on my work environment. It's shown a page like this:

Until other yesterday everythig worked perfectly.. Can you help me,please?
Thanks!

Check the below steps

DB Checks : Make sure the Db still exists , Ensure that user balmain'@'localhost has been granted access to the database in question.
Xammp/WAMP/ Server Checks : Check for MYSql service is running , check if the port is changed or not .
Magento Checks : clear cache ,Disable all 3rd party modules on the server , Make sure you have reset the file permissions Magento Wiki

If you are still getting error messages, verify that the username, password and database name /app/etc/local.xml

Wrong username and password or invalid access rights to you MySQL server.

Check app/etc/local.xml and verify your credentials.

If you need to reset you MySQL password you have to access your MySQL shell and use the following command (replace with correct information):

GRANT ALL PRIVILEGES ON yourdbname.* TO 'pctekcom_magento'@'127.0.0.1' IDENTIFIED BY 'yourpassword';

NOTE: MySQL username and password, NOT Magento username and password.

If you have phpMyAdmin you can use the "users" function.

Also try using localhost instead of 127.0.0.1 in your app/etc/local.xml, sometimes it fails the reverse lookup for localhost.

Your server host is localhost:8889

So on the Database Server host try to give localhost:8889 instead of on localhost.

Hope this will help you