Beagleboard angstrom green page freezing

Hi everybody.I have problem about the beagleboard.My aim is
implementing the opencv application on the beagleboard.i will do it
with angstrom.The beagle is working correctly.I can see it from the
minicom.But when i was plug in the monitor,the beagle gives the screen
but its just the green page.The password screen is not coming because
of that i cant enter the password.The mouse can move but i cant click
anything.can anyone help me?