installed atv flash but black screen

hi

 

i just used greenpoisen to jailbreak my apple tv2 it worked fine until i installed atv flash i followed the instructions and it saied sucsesfully installed and when my apple tv2 was rebooting it went black...

 

what now...?

 

thanks in advance

i tried to put it in dfu mode then it starts up and shows the apple logo but still black screen.....