An Operating System Wasn't Found After BIOS Reset or Disk Clone Windows 10, 8 & 7

How to fix black or blue screen error with "An Operating System Wasn't Found an operating system wasn't found try disconnecting any drives that don't contain an operating system" after BIOS reset or disk clone in windows 7, windows 8 or windows 10.

This video will is related to An operating system wasn't found error when booting windows, which may result from improper BIOS configuration after BIOS update, BIOS reset, cloning HDD to SSD disk or after manual changes in BIOS settings.
If the error is related to another source such as new PC, corrupted Boot Configuration Data, missed or deleted system files or others, watch the following video to learn how to fix that:
https://youtu.be/gwF7MKAylqQ

An Operating System Wasn't Found. Try disconnecting any drives that don’t contain an operating system
Press Ctrl+Alt+Del to restart.

The list of the most common keys used to open BIOS Settings on Windows computers.

Lenovo:
Desktop= F1, F2
Laptop & Notebook= F1, F2 or Nano Button

Hp:
Desktop & Generic= F10, Esc
Laptop & Notebook= F10 or Esc
Tower= F1

Dell:
Desktop & Laptop= F2

Asus:
Desktop= F9
Laptop & Notebook= F2 or Delete
Acer:
Desktop= F2
Laptop= F2 or Del

Samsung:
Notebook & Ultrabook= F2
Ultrabook Ative Book= F10

Sony:
Laptop= Assist Button, F1, F2, F3
Toshiba:
Laptop= F2
Protege, Satellite, Tecra= F1, Esc
Equium= F12
Compaq= F10

Fujitsu= F2

Видео An Operating System Wasn't Found After BIOS Reset or Disk Clone Windows 10, 8 & 7 канала ValiumMedia Tech