You can try downloading the Windows 10 installation media and doing a clean boot:
https://www.microsoft.com/en-ca/software-download/windows10
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When i start my pc i get this black screen which used to show dell logo and after that my screen automaticaly gets back to normal and then login menu appears.
I thought performing reset pc would clear my problem but it made it more worse now after reset i even cant reach to login menu , i dont know whats going on my screen because of this black screen
You can try downloading the Windows 10 installation media and doing a clean boot:
https://www.microsoft.com/en-ca/software-download/windows10
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If this is helpful please accept answer.