F8 isn't a bios setting, thats why it doesn't show on that page. Also, F8 doesn't get you into safe mode anymore on Win 10.
I don't think its your graphics card, though odd it happened. See if booting into safe mode fixes it, sometimes it can. Running start up repair might as might fixing MBR as that looks like what this is.
On another PC, download the
Windows 10 media creation tool and use it to make a win 10 installer on USB << its just a boot disk
change boot order in bios so USB is first, hdd second
boot from installer, on 2nd screen after languages, choose repair this pc, not install
choose troubleshoot
choose advanced
choose start up options
hit the restart button
choose a safe mode (it doesn't matter which) by using number associated with it.
Pc will restart and load safe mode
you could try this in safe mode to fix gpu if it is cause:
http://www.tomshardware.com/faq/id-2767677/clean-graphics-driver-install-windows.html
if Start up options isn't available, try a start up repair, it is on same menu. It might fix this as well. It will ask for login info
How to fix MBR (Start up repair can do this):
Another choice is:
change boot order so USB is first, hdd second
boot from installer
on screen after languages, choose repair this PC, not install.
choose troubleshoot
choose advanced
choose command prompt
We need to use the Bootrec.exe tool. Click on command prompt and type in the following commands, one after the other:
bootrec /RebuildBcd
bootrec /fixMbr
bootrec /fixboot
Exit
Now go ahead and reboot your system. In some cases you may need to run some additional commands.
bootsect /nt60 SYS or
bootsect /nt60 ALL