I have a G4 Cube, and it's Studio Display seems to be preventing it from going to sleep. It goes to sleep when the display is not connected and when I use a different display (the other display is not a Studio Display.) When I try to put it to sleep, it immediately wakes back up. Also, I'm not sure that this could cause the problem, but perhaps the broken USB ports on the back of the display somehow affect the computer? Is there a way to somehow allow the computer to go to sleep again? Thanks!