Well, if the laptop was set to be able to "Fast Boot" it would make it so you couldn't get into BIOS. Add that to what it sounds like is a lack of OS on the computer, which could also be that drive going bad (lets hope not) then you would have to actually install the OS again first, before you could access BIOS again. Unless, of course, that was also removed. Or a bad version was installed.
How To Fix "Operating System Not Found" or "Missing Operating System" error.
1. You will need your Windows OS (Operating System) CD or bootable Windows OS USB device.
2. Connect the bootable USB device or insert the CD into your computer.
3. Now use the "F2, F12 and Delete" keys enter BIOS setup.
4. Click "Repair Your Computer" below the "Install Now" button.
5. While you are in the "Repair Your Computer" open "CMD" (Command Prompt).
6. When you are in "CMD" type “diskpart” then type “list volume”.
7. Next you will be in "list volume". All volumes should be shown.
8. Find your system volume, where the windows are installed and then type “select volume ###“(system volume C) shows on CMD. Ex. select volume 3.
9. After you have selected the volume, type “ACTIVE“. Your system partition is active now.
10. Now type ”exit” to leave diskpart and then type ”exit” again to close CMD.
11. That’s it now RESTART your computer.
This should work, if you follow the steps correctly.
NOTE: When typing in anything, do not include the quote "" marks, otherwise things will not work correctly.