Windows version, it will not shutdown...
The laptop starts the shutdown process with the spinning windows thingy, then the screen goes black but the power light stays on and the hard drive light flickers occasionally except it never powers down, then after about 1.5-2 minutes the desktop just pops back up (not like the computer was restarted, just pops back up) but it didn't reboot.
The strange part is selecting Restart has very normal behavior, the Windows Restart screen with the spinning windows thingy pops up for about 15-20 seconds, then it shuts down and the BIOS screen pops up and it reboots normally.
So on a restart the laptop is doing the shutdown process normally and restarting, but on an actual shutdown it is not getting to that point (no BIOS screen) and the desktop just reappears after a couple minutes.
I have tried updating and downgrading the Intel Management Engine Interface like several online help forums mentioned, but it didn't change anything.
Solution as I found :
Start -> Settings -> System then select Power & Sleep and scroll to the bottom and pick Additional Power settings, this opens the Power Options menu. Now select "Choose what the power buttons do" and then "Change settings that are currently unavailable". Scroll to the bottom and under Shutdown Settings untick "Turn on fast startup (recommended)" then Save Changes and it works now.