Windows 10: Computer won’t start properly

When I start my computer it says this “Windows failed to start. A recent hardware or software change nighcause. To fix the problem:1. Insert your Windows installation disc and restart your comple2. Choose your language settings, and then click"Next.3. Click"Repair your computer.If you do not have this disc, contact your system administrator or computermanufacturer for assistance.File: \EF\Microsoft\Boot\BCDStatus: Oxc000000fInfo: The Boot Configuration Data for your PC is missing or containserrors.ESC-UEF1 Firmware Settings”I don’t have any disc to restart my computer. Is there anyway to fix

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Windows 10 won´t start any program as Administrator

Hello. I´m having this issue since installed one of the latest Windows 10 system updates.

When I try to open any program that requires Administrator confirmation (that screen with the Yes/No question), this dialog won´t appear anymore. The screen background stays darkened and nothing happens.

1. Using Windows 10 Home (x64)
2. My microsoft user account is properly checked
3. I´m the administrator of the PC
4. Already tried do create another administrator user account - same problem, no success
5. Cannot start any program/service that requires administrator authorization (not even regedit)

Please help!

 

Lumia 830 main camera won`t start

After windows 10 update my lumia 830 camera won`t start . It says Camera won`t start . I tried other camera apps but camera still not work . Front camera working plz help me . I did hard reset , soft reset , downgraded to 8.1 but problem still persist

 

I unplugged my computer to soon and now it won´t start up again?

Thanks for your answer.

This solution did not solve my problem since my computer won´t power up at all. it is as if the computer is completely dead and I have tried different outlets that work for other computers but it still won´t power up.

Is my motherboard broken?