Buenas...
Y he aquí otro error que me da Plesk:
ERROR: PleskFatalException
Unable to connect to database: mysql_connect() [<a href='function.mysql-connect'>function.mysql-connect</a>]: Too many connections
0: common_func.php3:108
psaerror(string 'Unable to connect to database: mysql_connect() [<a href='function.mysql-connect'>function.mysql-connect</a>]: Too many connections')
1: auth.php3:93
A ver si alguien me pudiera ayudar :(