G4 Will Not Shut Down!!!!!!!!

[hypergraphics]

My g4 won't shut down, closes top menu, dock leaves desktop. could this be some wierd betå or a java / limewire thing????? help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!help!!!

thanks
jonathan
aka: machead