I changed the root password to test and now I cannot login in phpMyAdmin page in XAMPP. I looked for help here and here which basically says changed config.inc.php>
I faced this problem as well but i could fix it by going to the folder /xampp/phpmyadmin/config.inc.php
Open config.inc.php, u will find (if no password) ['password']= '' or (if old password) ['password']= '123'
Change the password $cfg['Servers'][$i]['password'] = 'test' and u will be able to access phpmyadmin again :)