I made the same mistake of setting a password for the user 'root' via the console. Because phpMyAdmin defaults to the 'root@localhost' user login, it won't work because of the password.
You need to edit the config.inc.php file inside the phpmyadmin folder as follows...
/* Authentication type and info */
$cfg['Servers'][$i]['auth_type'] = 'http';
$cfg['Servers'][$i]['user'] = '';
$cfg['S
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