I have the problem with MySQL too. I've installed XAMPP v. 7.0.2-1 and opened localhost successfully, but when I opened phpmyadmin I got the error
Welcome to phpMyAdmin Error
MySQL said: Documentation
Cannot connect: invalid settings.
Connection for controluser as defined in your configuration failed.
phpMyAdmin tried to connect to the MySQL server, and the server rejected the connection. You should check the host, username and password in your configuration and make sure that they correspond to the information given by the administrator of the MySQL server.
I tried to fix this with editing config.inc.php (changed the authentification type to "http" & specified password), but it did not help.
Now it gives such a response:
Welcome to phpMyAdmin
Wrong username/password. Access denied.
Any ideas how to deal with this stuff? I don't want to reinstall XAMPP once more.