Hp L1730 (P9625A) tiene manchas en el display

Thanks for your tip, i'm gonna try. I wanna translate my problem for those english speakers. ** Hp L1730 (P9625A) has black stains on the display. When the computer is switched on a dark stain appears on the display monitor at the bottom middle right, as if the pixels in that area were burned or do not turn on those pixels. The remaining area has a clear image. I do not think the stain is due to hit because the surface of the LCD is fine. Please could give me a tip or trick as reducing to a minimum the stain? Thank you. Thanks for your tip, i'm gonna try. I wanna translate my problem for those english speakers. ** Hp L1730 (P9625A) has black stains on the display. When the computer is switched on a dark stain appears on the display monitor at the bottom middle right, as if the pixels in that area were burned or do not turn on those pixels. The remaining area has a clear image. I do not think the stain is due to hit because the surface of the LCD is fine. Please could give me a tip or trick as reducing to a minimum the stain? Thank you.