Windows 10: CPU usage stays 50% when idle until I open task manager

Discus and support CPU usage stays 50% when idle until I open task manager in Windows 10 Software and Apps to solve the problem; Hi! I'm sure it is a malware problem.Steps so far: 1. Full + deep Windows Defender Scan - Done - no use2. Microsoft Safety Scanner - found many threats... Discussion in 'Windows 10 Software and Apps' started by Sergey Ss., Apr 15, 2025.

  1. CPU usage stays 50% when idle until I open task manager


    Hi! I'm sure it is a malware problem.Steps so far: 1. Full + deep Windows Defender Scan - Done - no use2. Microsoft Safety Scanner - found many threats while scanning but at the end showed 0, wondering why???3. Ran a FRST.exe - as soon as I press scan it shuts downPlease help.

    :)
     
    Sergey Ss., Apr 15, 2025
    #1

  2. task 'system' in task manager runs a constant 8.2% cpu usage driving cpu temp to just under 50 degrees Celsius while pc is in idle.

    task 'system' in task manager runs a constant 8.2% cpu usage driving cpu temp to just under 50 degrees Celsius while pc is in idle. How can I fix this?
     
    Matthew Ruddock, Apr 15, 2025
    #2
  3. CPU usage remains above 50% until i open task manager

    Hello i noticed that my CPU was being used more than 50 percent until i open task manager. Just as if i am browsing or working on excel , i see my CPU usage spike from 10% to 60% and if i try to see which app or processor is consuming the CPU through task manager the CPU usage drops below 10%. Even while playing games, i monitor using msi afterburner CPU spike from 25% to 75% all of the sudden and even if i close the game morethan 50% of CPU will still be on use. Thenif i open taskmanager then only the CPU usage drops to normal. But if i keep task manager open and do anything gaming, browsing the CPU usage will always be normal. The issue is only seen when task manager or any process monitoring software is turned off.
     
    Aakash K.Chhetri, Apr 15, 2025
    #3
  4. CPU usage stays 50% when idle until I open task manager

    Task manager showing 100% CPU usage at idle.

    Task manager is showing 100% CPU usage at idle. If you look into the details to see what if anything is really using that much processing power and it shows "system idle process" at 99-100% when at idle. This is normal I know but task manager should not
    be including "system idle process" when its calculating CPU usage. This is causing my CPU to ramp up and my fans to stay at full speed at ALL times.

    Things I've tried:

    *Re installing windows. (multiple different ways and at different times throughout the diagnosing process)

    *Removed all ram and just a single stick (multiple different known good sticks) & and two sticks

    *Removed GPU

    *Cleared cmos

    *Bios Update

    *Multiple different bios setting and power settings

    *Adjusted all windows power settings plugged in and on battery (tho this is a pc)

    I'm at a loss. There is no performance loss but having my CPU automatically overclock and fans at full speed all the time is not going to work.

    Oh and on a weird side note, few nights ago was working on fixing this issue like usual and ended up accidently leaving the computer on all night (which I don't do because I don't like leaving the CPU overclocked it see's about 50-60c at idle) when I woke
    up and went to turn computer off CPU usage was at 1-4%...!!!! I was shocked and thought that some how it must have updated widows and fixed the issue. But issue came back next re-boot.

    SYSTEM SPECS:

    Mother Board = z77a-gb65

    CPU = i3 3240

    RAM = 16g (4x4g 2 corsair 2 pny)

    GPU = Gigabyte GTX 970 G1

    Thank you to anyone that can help...
     
    AudiMyMindS4, Apr 15, 2025
    #4
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CPU usage stays 50% when idle until I open task manager

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