Windows 10 booting issue?

My Windows 10 will only boot, can't access BIOS settings with F1 or F2 and next thing it says operating system not found and that's all it does every time i turn on the LENOVO Laptop please advise me what to do?

Do you have more than one hard drive attached to the laptop? Or a usb stick etc… Maybe your boot order has changed from the laptop harddrive containing windows 10 to one of the others…

when the load up screen appears try just hitting all your F numbers as fast as possible it may end up being f12 or something else.

Lenovo's usually use the F1 & F2 keys, however, you may need to press and hold the Fn key before pressing F1 or F2. So, reboot your laptop, find the Fn key (usually near the left CTRL key) and hold it down and press either F1 or F2 a few times per second.

A hard drive that has failed or has been corrupted usually causes this error. On a working computer go to the Lenovo website and download the diagnostic toolkit.

and go from there.

Technician… The hard drive's boot sector has probably become corrupt. Technician using commercial quality software can replace or repair the boot sector