Your laptop probably has a PS2 connector on either side or the back to accomodate a standard PS2 desktop keyboard. Try that.
If the problem is a stuck key causing a boot error, you will have to dive into your laptop and disconnect the laptop keyboard and reboot using the PS2 keyboard.
If the problem is a stuck key causing a boot error, you will have to dive into your laptop and disconnect the laptop keyboard and reboot using the PS2 keyboard.