Hi Meyak2,
Welcome to Sony Community!
Thanks for giving me information about what is going on with your laptop. Since the laptop is also shutting down even on BIOS page this is already considered as hardware issue. I strongly suggest that you bring the unit to a repair center to have them diagnose your laptop.
We couldn't tell what causes it for now that's why it needs to be checked.
I hope this helps.
Regards,
Jen
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