From reading this thread, I've got one observation and one suggestion.
First when Windows shuts down it no longer has any control of power or anything else. That's all controlled by the motherboard.
Windows cannot fully shut down the motherboard. There has to be 5vdc available to the START button or you can't turn on the PC.
It's also available to certain parts of the motherboard and sometimes even some plug in cards.
Two, if you really want to SHUT DOWN your PC, then plug it into a switchable power strip that you can easily reach, and after your PC (Windows) has done its ShUT DOWN, turn off the power to it. That's much safer than leaving it powered up all the time.
If your BIOS is set correctly, when you turn the strip ON, the computer will also come on, monitor ON, speakers ON, etc., everything plugged into the power strip. I find this very helpful to bring up my whole system with just one switch.
And, I know when it's OFF, it's really OFF.
Cheers mate!
Old Timer