Problem to reset routerboard

Hello,
i am new member here and i have a problem to reset one routerboard 411L.
It dont have serial port,and i tryed to push 30 seconds on plug in ethernet cable to it but nothing dont reset.

I need to reset come when i try to login with winbox or telnet leave me an error becouse if i am loocking with hyperterminal RB is blocked to starting services and login dont appear.

How i can do to reset it? Write easy english becouse mine is bad.

Alessio

Try following this guide: http://wiki.mikrotik.com/wiki/Password_reset