popatim :
If you are running win 8, 8.1, or 10 then you probably aren't shut off. You need to hold down the shift key while you click shutdown to get a true poweroff otherwise the system will enter a hybrid low power state much like hybernation. They do this to facilitate a quicker startup.
Thanks, I have just gone from Win 7 to Win 10 and found that my USB ports are now live after shutdown., quite annoying in this case as the PC is silent so I connected a usb plasma ball so I knew when I had left it on.
No changes had been made to bios or anything else, just the upgrade.
This has helped me as it works - if I remember to use the shift key !
If anyone finds a way to do this in windows 10 settings somewhere please let me know.
In the meantime - THANKS!