First, go to your WAMP control panel and reset the MySQL root password. If you receive an error when resetting the password, it means your MySQL master user database is corrupted, and you will probably need to re-install WAMP. But first, let’s see whether your current root user credentials work.
Next, use your WAMP control panel to access the MySQL console. Use the new root password, or if the password reset failed, use the old root password. If you are able to access the console and get a mysql> prompt, type quit to leave the console, and then attempt to log in to phpMyAdmin using the root user and password.
If you cannot access the MySQL console, then your MySQL installation is corrupted, and it is unlikely you will be able to save your databases. If your database was large/important, you might want to consider posting a question on a MySQL support forum concerning data recovery methods.
If you were able to access the MySQL console, then log into phpMyAdmin with the root user/password and export your database(s). Make sure you export them to a different logical drive, or if you have not created logical drives, then export the database(s) to an external backup drive. A USB thumb drive would be fine.
If the root user password could not be reset but you were able to export your database(s), you should now re-install WAMP, and then you can use phpMyAdmin to import the database(s) you just exported.
If you could reset the root user password above, click the Users tab in phpMyAdmin, and attampt to change the password of the user that is accessing the WordPress database. If that is successful, your problem should be solved.
