If your computer does not turn off the power when doing a shutdown, you may need to edit the registry. I have all the correct BIOS and Power settings and still needed to do this.

1. Start Regedit
2. Go to HKEY_CURRENT_USER\Control Panel\Desktop
3. Edit the key PowerOffActive and give it a value of 1
4. You can do the same in HKEY_USERS\.DEFAULT\Control Panel\Desktop