Chosen Solution

I checked with another hard disk but shows the same warning and could not boot up entering the F8, F9, F10 or F12 keys to install windows from a flash disk.

Actually with two reasons were my laptop not working: My original hard disk has failedBios setup had locked the UEFI mode so that i couldn’t install windows. So i gave it to a technician and check it in the hardware part and unlock the UEFI mode and clean formatted it so as to work again.

A “No bootable device” error is a sign that your computer’s startup BIOS/UEFI did not find a device to use to load the operating system. Please try the following:

  1. Enter BIOS/UEFI setup by pressing F2 (or the Fn + F2 key combination) while the computer is booting. In BIOS/UEFI setup, make sure that your hard drive is first on the list of bootable devices.
  2. If your computer’s hard drive is indeed first on the list, then the problem may be originating from the hard drive itself. In this case, you may need to create a bootable USB by downloading a Windows 10 ISO image from the Microsoft website. You can then use this bootable USB to perform a startup repair for your computer, or you can use it to reinstall the operating system.