broken lcd, problems using external monitor...

hi all, my macbook pro has a smashed LCD panel due to spectacular cycling accident. the machine itself still works fine and i have been using since without any problems by connecting it to an external monitor. the monitor has always just automatically woken up as i turn on the MBP. then yesterday i turned on the MBP and nothing happend. the external monitor did not wake up. i know the MBP is booting up as usual because i can hear it doing so through its own speakers. i dont remember changing anything the last time i was using it. i have no way of changing any settings in side the machine and i dont know what to do. i have tested the monitor and connections with another laptop and it works fine. does anybody have any ideas? please help... im on the brink of smashing things....