screen light is flickering although it is turned off.
This is not a good sign and indicates the laptop was electrically damaged inside.
Do I still have hope for my laptop?? To retrieve files at least
The hard drive shouldmight be fine. YouA service person should be able to put it in a carrier and retrieve files. This should work. It depends on the total damage, but I think this is a hopeful idea.
It is probably worth your while to take the machine to a local service shop and have it assessed. Do not turn the machine on at all. Leave it and let a service person determine the next step.