Hi Mr.Shivam -
What are the changes you made on your computer before this happened?
Is there any programs running on the background that you've downloaded after you get the computer.
Can you try to scan your device to see if there are corrupted files that make your Windows logo disappear.
Press Windows key and type CMD
When you see command prompt right click on it and run it as administrator.
once you are on the command prompt window type: sfc /scannow
if the scan didn't find any corrupt files try running your computer with only the most essential files and services required by the Operating System.
press windows key + R
type msconfig
go to services tab and tick the "hide all Microsoft services" box.
click on disable all then apply - okay.
it will ask you to restart to apply the changes.
Thanks.
Kevin B.
Independent advisor.