Samsung Notebook keyboard not working and stuck at boot screen

I have this Samsung Notebook and after using it for certain time, the PC crashed giving DOS sounds. When I started the PC again, I was at the boot screen asking me to choose the OS. Although my keyboard didn't worked. Now my PC is somewhat a brick. How can I solve this issue? What's the best way to restart the keyboard?

Could you please write exactly what you see onscreen? What is written?

Well I used an external keyboard now I can fiddle with the notebook. Although when I start windows normally or try to launch with system repair, the notebook gets stuck and with black screen and beeps none stop.

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