Long boot due to a black screen before sign-in screen

Jun 13, 2018
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Greetings! I currently have a Dell Inspiron 7567 and recently, I have been having trouble upon booting up my PC. After the dell logo shows up upon booting with the loading animation, everything goes black for a random amount of time (Not longer than 5 minutes to be exact) before the sign-in screen finally shows up.

Several solutions that I came up while searching in the internet with were toggling the fast boot option, updating the bios to the latest version (1.7.0), reinstalling display adapters by uninstalling them and waiting for windows to automatically reinstall them, booting into safe mode (still resulted with the same problem surprisingly) and also editing a plentiful of power options but all of these solutions failed. Many people from my searches are quite sure that it is a windows 10 problem which kind of makes me want to downgrade to Windows 7. Unfortunately, I have very important files that are in this PC and I don't have immediate access to a backup drive. On a quick note, I also realized that whenever I boot up with the AC plugged in, the sign-in screen doesn't show up at all. It only seems to show whenever I am in battery mode so I assume it's some sort of a power option that I changed along the time of using the device.

Similar situations I saw that would describe this are the following:

https://www.youtube.com/watch?v=TnI5NL4csck

https://www.youtube.com/watch?v=mC_ITGBBEsI

Thank you for reading! Please help.
 
Jul 29, 2018
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Due to a vga Signature with uefi it give a black screen without showing uefi bios options during boot soGo to uefi firmware and turn of the secure boot. It solve the problem.
 
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