Hi, There is quite a bit on ways to tackle this problem on utube, but it depends on your technical ability in most cases.
If you only want to use the Laptop, and don't need to go into the BIOS, from what I can see it should still be perfectly useable.
You could try the Function keys if you are looking for a Boot Menu - probably need to disable fast boot first. It should also boot from a bootable USB, if it can't find anything else ie remove the hard disk (or put a blank one in if you want to do a fresh install) Still sounds like a useful Laptop unless is there something else that you actually need to access BIOS for.
Pete