@claudioedgar connect an external monitor to your computer. If that works you know that the issue is your LCD screen. Could be the screen itself or could be the video circuitry (GPU) on your computer. Let us know what an external monitor shows you.
Translation
@claudioedgar conecta un monitor externo a tu ordenador. Si eso funciona, sabrás que el problema es tu pantalla LCD. Podría ser la propia pantalla o podría ser el circuito de vídeo (GPU) de tu ordenador. Haznos saber lo que te muestra un monitor externo.