Hello steemian friend..causes such as because computers, laptops or notebooks fail to read the operating system on the hard disk. The cause of the operating system not found is that the bios settings are less precise, and the priority boots on the wrong bios, and the latter is caused by the hard disk that is interrupted or problematic. Here I will tell you how to solve the operating system not found or error.
for example as image shown below
foto error
change boot device
try to restart your computer, laptop, or notebook, you will see a black color and there is writing on the top left "operating system not found". when it happens press CTRL + ALT + DEL simultaneously, it will restart again, then press F2 key on keyboard continuously until entering bios, After entering bios choose Boot menu usually beside menu Advanced, then change on 1st boot device into UEFI or LEGACY, then press F10 to save the changes. then press yes.clean the hard drive
If the first step has been done but still experiencing the same thing that is, the operating system is not found. Unloading the hard disk on the back of the notebook or laptop with a screwdriver. This may be due to a dirty hard drive, remove the hard disk, on a copper or brass hard disk, clean it with a soft brush, and blast between copper or brass and plug the hard disk plug connected to the notebook or laptop hive. Slowly. After that plug the hard drive back on the connector. then try restarting notebook or laptop.
So that's how to Overcome Operating System Not Found in Windows, hopefully this post can be useful for steemians friends. Hopefully you can solve the problems that exist in your computer, notebook or laptop. Keep trying and good luck.