i upgraded my pc to windows 10 and after complete installation it opened up but i did not sign in. now whenever i open my pc , after the loading sign of windows ,their is no display its just a black screen.even though their is sound of startup sometimes but their is no display....even if press any button, their is no response.when i go in boot options and select troubleshooting, it asks me for a password even though i have not set any password(as i mentioned first). Please help me to find the solution.
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