I have had this annoying problem with my Inspiron 15z 5523 laptop.
I have done normal "Shut down" operatio through Windows 8.1 and laptop sometimes restarts instead of shutting down.
And my laptop also hangs after Windows shuts down. (I noticed this happening when Windows shuts down while Display is turned off) See my detailed work...
Look at my screenshots below, I will describe in details what I have figured out but I hope what I have done didn't screw up my laptop.
In this screenshot, I have turned off and turned on my laptop 35 times...
You'll notice a correct mark beside the number, that means the laptop shut down successfully.
For example, the first time, laptop shut down, (2) laptop shut down, (3) the third time, laptop shut down, etc... whereas the number marked by "x" that means laptop hanged on shut down...
Notice the title at the top I type on the board when "Screen is off" I mean by screen is off that I let Windows turn off the display after 1 minute,
Now I let Internet Download Manager turns off laptop after it finishes downloading, so it will turn off it while the screen (display) is turned off, so when the display is turned off, the 11th time, laptop hung on shut down, only power button and fan was running.... I have to hold the power button to shut it down..
Now, see when "Screen is not turned off" and when IDM finishes downloading and shuts down laptop, I tested this 22 times as in the picture and laptop shut down successfully.
Now look at picture number 2,
I tested again when the "Display is turned off" and letting Internet download Manager turns off laptop when it finishes.
In the first time, laptop restarted instead of shutting down, the 7th time it restarted instead of shutting down, and in the 14th time laptop hung on shut down..
I read through internet that I can disable "Wake on Magic Packet" in Device Manager > Wireless and Lan...
However, in the 17th time, laptop as well hang on shut down.
Now, I set "Turn off the Display" to "Never" now the screen is not turned off, and when Internet Download Manager turns off the laptop, see, I tested this 30 times, laptop shut down successfully except for this in the 12th time it restarted instead of shutting down.
I turned off laptop and turned it on 50 times this time but this time I didn't use IDM to turn it off nor I turn off the display, it is just normal shut down using the "Shut down" command in Windows 8.1
See in the picture, in the 12th, 32nd and 37th times, laptop restarted instead of shutting down...
Even the normal "Shut down" operation often causes windows to restart instead of shutting down and when Windows shuts down while display is turned off, it often hangs on shut down which can leads my CPU fan to wear out eventually if I am not using the laptop and sleeping that time...
However, I am still unsure if laptop only hangs on shut down when display is off or no as I can't test this anymore because I have turned off laptop and on about 200 times in a day just to test this...
However I am not going to "turn off display" if I am letting IDM to shut down windows when it finishes downloading, however it may restart Windows instead of shutting it down sometimes which is still a problem for me, if I am leaving laptop to download for about 10 hours and went to sleep say for 10 hours, the IDM restarted laptop so it will be 20 hours for laptop being on.... Do you think this is good for a system like mine???
Inspiron 15z 5523 i7-3537U????!!!!
And if you're going to say "DISABLE" "Turn on Fast startup" option.
I have already done that, however laptop still restarts sometimes instead of shutting down and hangs on a black screen sometimes when it shuts down when display is turned off (Not 100% sure, it may even does hang when display is not even turned off).
Look at this video, this is how laptop hangs after Windows Shuts down.