I have an October 2008 Unibody MacBook. Recently the hard drive will not go to sleep with the lid open. Prior to installing Snow Leopard, after a period of inactivity the MacBook's display would go to sleep, followed soon by the hard drive (so that the blinking white light would appear) even with the lid open. Currently the display will go to sleep but the hard drive seems to stay active. The MacBook does go into full sleep with the lid closed. Is there anything I can do that will allow the computer to go to sleep with the lid open? Thanks in advance for any help.