Windows 10: Why did my pc turn on by itself in the middle of the night like 2 hours after i shut it...

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Turning on/shutting down issue

Hello,
I cannot turn on my PC at all until I unplug something, like when I try to turn it on it doesn't work, I unplug the Display port then I turn it on and after it turns on I replug it.
I also have problems with shutting down, I sit the pc down from Windows and it shows me the "shutting down" thing and then it suddenly shuts off like it's been unplugged from the wall.
I have my AC, phone, monitor, router and PC.
And I'm using some extensions and adapters because the wall plug is pretty far.
By the way I replaced my Mobo CPU, ram and GPU because the previous build had other problems.
System Builder
Thanks in advance.

 

Windows 10 PCs start in the middle of the night

I have recently upgraded two PCs to Windows 10. Both computers do use "hibernate" extensively. Both are set up in a way so that keyboard, mouse and ethernet commands are not waking the PC.
Unfortunately, both PCs have startet to wake up in the night and stay awake for hours on end. This is totally annoying and costs a lot in terms of energy, so I'm investigating why this happens.
Powerconfig often fails to show any reason, but most often updates seem to be the culprit. Is there any way to force the PCs to stay shut down in the night? Unplugging is not really an option, since one of them is a laptop.

 

Windows 10 PCs start in the middle of the night

Both PCs have started to wake up in the night

You need to check two things:

1. Automatic Maintenance settings.
   
2. Scheduled Tasks.
   

Automatic Maintenance

Windows performs Automatic Maintenance at a set time (usually in the middle of the night).

Note:

• By default, Automatic Maintenance is set to wake up your computer and run maintenance tasks at 2 AM.
  
• You must be an Administrator to change the Automatic Maintenance settings.
  
• See below for instructions on how change the time.
  

Scheduled Tasks

There may also be other Scheduled Tasks that will wake your PC. To check these:

1. Run the Task Scheduler.
   
2. Click on "Task Scheduler Library".
   
3. Check if there any tasks scheduled to run during the night.
   

How to Change Automatic Maintenance Settings in Windows 10

Source How to Change Automatic Maintenance Settings in Windows 10