Ever since I hooked up my new Samsung Laser printer to my USB hub my mac has been waking itself up from sleep mode out of itself. I'm pretty sure that the printer is sending signals to the computer to indicate its status. I don't really want to have to unplug my printer or hub every time I close the lid of my pb. Is there a way to stop the computer from waking up with it receives a USB signal? Hope you guys can help!