mysql一直报错: Access denied for user 'root'@'localhost' (using password: YES)

The Internet to find a number of methods have failed, after reloading, too, but in the process of reloading mysqld -installdisplay already exists, a closer look at the original computer has been installed mysql, left behind a long time ago when loading pagoda panel, so if you has been an error, it can also check is not already installed