OK, when I am away from my computer for several hours and have things being downloaded, i just put my display to sleep. however, just yesterday (the last 2 times i have put the display to sleep for over an hour) my screen will not come back. it just stays black. i have had to force power down to be able to get my screen back. not to mention, every time i do this, i lose about 70% of my download progress. basically taking 1 step forward, 2 steps back. anyone know whats wrong? why wont my screen come back? why does the display stay asleep? please help and thanks!!