How to fix Boot device not found error in your laptop

Two days ago when I was pulling out my laptop from the bag, accidentally, it slips from my hand and fell on the floor. My heartbeat increased immediately as this laptop is my only ally in this lockdown. I turned on my laptop and saw the thing that i  never really wanted to. Yes. The picture above is what i saw. I became bewildered. But i controlled myself and figured out in youtube about the problem. Then i found the reasons for which my laptop was not getting started.

1. My hard drive got crashed (you need to change your laptop hard drive)

1. any of the cables or connection of my hard drive may be lost detached (just tighten the connection)

Guess what would have happened in case of mine. Yes, I was lucky enough that i had the second one and I fixed it by myself. But don't try this at home. just relax and consult with a repairer to figure out the problem.