My computer did not shutdown and I tried everything in the book. I later found out this was due to a battery in the computer which remembers your settings, always remembering to restart your computer. Here is the fix. Turn off the power to the computer and unplug it from it's power source. Next, unplug all the cords from the back of the computer. Now look towards the back of the computer on the side, you'll see a large screw. Unscrew this screw and slide the panel to open the computer (make sure the power is off). Once the side panel is off, turn the computer on it's side and look for a large round (watch type) battery. Fiddle with the battery and pull it out. Keep the battery out for about five minutes and then put it back in. Next put the side panel of the computer back in and screw it back on. Next, reconnect only the monitor, keyboard, mouse and power to the computer. Turn the computer back on. Once on the desktop, shutdown the computer and the computer should remian off. Goodluck!