bios crash

Hi all I have a Acer Nitro 5 laptop that will not boot it will either crash on the loading screen or it will say not boot device found. I can access recovery options I have used check disk in bios that flags up an error with stage 3 security. I have tried using start up repair that cannot fix...

This happened to me twice in three weeks. I turned off the notebook and when I turned it back on I could not enter the BIOS menu. I could not see the previous Asus logo either. I tried the F2, delete and ESC keys all, I tried removing the battery and turning it on. I cleared RAM memories...