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The only time CPU is really at 0% usage is when the computer is turned off. Whenever the computer is turned on and Windows is running Windows itself is using the CPU. Then there are numerous background tasks running.
With most PCs today having multiple cores it is possible for some of the cores to really be at 0%. However, there will always be at least one core at more than 0%. Note that CPU usage that shows 0% is only an approximate value. It has probably been rounded off so could actually be just less than 0.5%.
You can use PowerShell to list processes in order of CPU load to see what's causing the spiking.
- Right-click on Start.
- Open Windows PowerShell (Admin).
- Paste the following command and press ENTER/RETURN:
This will show the first 20 processes in order of CPU load.Code:Get-Process | Sort-Object CPU -desc | Select-Object -first 20
Hope this helps...