beagleboard-xm start up problem

hi, from the day i bought bb-xm , its not booting up, the sd card shipped with the board and many angstrom images i tried didnt worked out… i even tried Ubuntu but no luck.
i am using lcd monitor,hdmi -dvi connector,straight through cable …
when i am connecting its showing no signal to monitor, and its not detecting keyboard or mouse.
unable to understand whats the problem,plz plz help… my project submission date is near…
its urgent…