Computer not shutting off?

[RE_V3RSE]

I have recently run into a an issue where, when I click shut down in the start menu, my computer will appear to be shutting down, the screen will go black for a few seconds, but then the lock screen will reappear. My case lighting doesn't turn off at any point. I have anti-virus, and haven't installed anything recently except for some well known Skyrim mods off of the official Nexus Mods site. I have literally no idea what the issue is, or where to start. 

 

motherboard: Gigabyte GA-H170 Gaming 3

CPU: i5 6500

graphics card: Gigabyte G1 Gaming R9 390

RAM: Corsair Vengeance LPX DDR4 2133mhz

PSU: SilverStone Strider series, 500w, 80+ bronze (I think) not 100% sure on model number, think those are the specs though

 

I haven't changed any settings in the UEFI, asides from one that makes my motherboard lighting pulse. Had this error before when I installed the drivers for my LG 24MP48HQ - P from the LG website, but rolled back and that solved it. Not sure what the error is now though, and I would really appreciate some pointers, or at least some help on how to figure out the problem my self.

 

Thanks in advance!

[VextGamer]

I've had this issue too, Just try to turn it off by pressing the physical button or turn the power supply button off in the back!

 

For the windows turn off, it has happened to me, but it comes and goes and I've not had it happen enough really to see what could be the issue!   

[RE_V3RSE]

12 minutes ago, VextGamer said:

I've had this issue too, Just try to turn it off by pressing the physical button or turn the power supply button off in the back!

 

For the windows turn off, it has happened to me, but it comes and goes and I've not had it happen enough really to see what could be the issue!   

Thanks for trying, but could have figured this out myself mate  I really want a proper solution, as force shut-downs can sometimes kill background programs that ought not to be killed without notice.