That event just is saying the computer wasn't shut down correctly. If you yanked the power cord out or held down the power button to force shut off it would tell you the same thing. You need to see if it threw any events/errors right before that.
What is make and model of power supply? How old is it?
You can sort event viewer by time so just scroll through and see what preceded the power event error.Where would I see this "events/errors" before the shutdown. Why do you suspect that it wasn't just a power glitch ?
Your computer has become self-aware. It will only get worse, trust me.What would cause a computer to restart by itself ? Is it a momentary power glitch perhaps ?
It is a miracle that a computer works. It has millions of pieces and many layers of PCB. You need to be really specific about how it shutdown and when it happened. It is very unlikely to happen because a Windows fail
See my laptop is a Dell inspiron 5555. It was with problems when it was bought, didn't loaded windows. That was in April 2016.We had to call Dell and they told us how to reboot. Some time after I needed to partition the disk and it lose all partitions and I had to erase all and repartition the drive, losing recovery. So, the best solution we know in my country and the one that really works. Format, install windows, use DriverPack (very good) and now I'm writing you without any problem. Be radical.It is not a " Windows fail" It seems to be an issue with Windows 10, the computer restarts after it does a windows update . I just got off the phone with Dell and they couldn't find any fault with the computer. I think that he even said that it seems that this is occurring when an update is installed . Maybe Microsoft will find a fix for this problem . The only strange thing is that I have had the computer for one year now but it is only recently the it has been doing this, maybe there haven't been updates to Windows 10 till now and that's why the problem is recent. I think it even said on the internet that this started happening after the Creator's update to Windows 10 .