One day, Laptop doesn't work anymore

After 5 months, without problems, one day I try to turn on the laptop and it´s impossible
Then I put it to charge for almost a day, but I don’t get that it works.

What can I do¿?

My labtob has still warranty, but I don’t understand in this website how execute it

Could you help me please¿?

Hi! How are you doing? How is your laptop? Could you fix it?