White Screen of Death. Macbook Pro. Please help!!

Hi there! I desperately need your help.

So I was using my mac, everything normal until one day it freezes and I´m force to shut it down.

Unfortunately when I tried to turn it back on, it just got stuck in the famously known white screen of death. Most of the times, is just the white screen without logo or image folder or anything.

I know my computer is alive because sometimes (not often) the apple logo appears and I´m able to try reinstall OS X (but then it crashes again), but most of the times is just the white screen.I have tried most of the inputs and they do not do the trick (Cmmd + R, Shift, etc. Most of them don´t work and don´t do anything, except for the zapping PRAM input which is Cmmd+Option+R+P, however after the reset, it still just shows the white screen most of the times.)

Is there a way to fix this problem?

Thank you so much.