Running Windows 8 Dev. Preview on a Dell Latitude D610 (1.73Ghz, 2GB). System Hibernates fine (my main mode of powering off) but will not properly shutdown or restart. Every time I hit shutdown/restart it goes to a black screen. I know that it's still running because the power light is still on and the hard drive light flashes just as if it were still in use. I've let it sit for 3 hours in this state and it still refuses to shut down. Any ideas?