I don't have a VGA adapter, would you be willing to do something like this: http://www.mediasmartserver.net/forums/viewtopic.php?f=2&t=609
In the post I linked, the poster counted out the number of times you need to press the down arrow to get to a BIOS setting in the EX470 to change a setting, and then you press enter to select a setting, press the arrow again to move to the right choice, and then set and save the setting.
It'd be amazing if you could help us out with this, since without the VGA cable, there's no way for us to change this setting otherwise!