It starts spinning right after powered on. The laptop doesn’t seem to be heating up, CPU is about 40 celsius. I turned off my laptop and left it for several hours and when i turned on my laptop the fan starts spinning right away.
Now I noticed that his behavior has changed: he spins like a crazy for about 10 sec., stop for 10 sec. and then again spins, and it seems repeating. And this is happening without any apps running
Just because you are not running apps does not mean the OS is idle. At any one time, there are DOZENS of tasks that Windows is running behind the scenes and all of them are using processor power.
With a Win10 PC, you're going to experience a variety of problems not typical of the older PCs. Unlike with older OS versions, Win10 FORCES updates and patches on folks every week. This can cause problems not seen in the older OS versions.
First is sluggishness. You may experience a very slow PC at times because Windows Update (WU) is hogging your PC, searching for, downloading, and installing updates -- to bring your PC up to the most current version of Windows. This can also contribute significantly to high processor temperatures, as it is being heavily used.
Second is fan noise. That's directly related to fan speed, which is the result of processor heat, and WU is known to drive up the processor load -- sometimes to 100%. That can cause the fan to run loud and continuous for some time.
Third is disk usage. WU can easily force the disk usage to 100% and and keep it pinned there for some time. That's because it writes WU files to the drive, then it turns around and reads them, then it overwrites existing Windows System files. All of that takes a lot of disk usage to complete.
These processes are compounded by Win10 because new Win 10 patches coming out nearly every Tuesday. Since you can't stop Updates like you did with Win7, this means you're going to get updates, regardless of what you do.
To find out what version and build of Win10 your PC is running, do the following: 1) enter "cmd" (without the quotes) into the search area and select the Command Prompt option 2) enter "winver" into the command window (again, without the quotes) 3) The most current Win10 versions as of 9/16/20 are the following: a) v1809: Bld 17763.1490 b) v1903: Bld 18632.1110 c) v1909: Bld 18363.1110 d) v2004: Bld 19041.508.
If yours is older than that, most likely WU is hogging your PC trying to update it.
Some folks have been told that resetting your PC will fix this. but, if you reset your PC, you only make matters WORSE! Why? Because you will reset Win10 back to the original version that came preloaded on the PC and that will restart Windows Update all over again.
To disable WU temporarily, do the following: 1) Enter "services" in the search area (again, without the quotes) 2) When the window opens, scroll down until you see Windows Update 3) If it say Running under status, that indicates that WU is running 4) To change that, double-click on that task, select Stop under the Service status, and then Apply 5) That should stop WU -- and you should see an immediate improvement in performance.
If not, then WU is not the problem.
WU will restart itself automatically later on, so you basically have no choice than to bear with it until it finishes.
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