Laptop LCD screen dark is described that you can only see vague image when adjust the maximum brightness, and the screen backlight does not shine, if not look closer, it would like a black screen. Indicator lights are lighting and flashing normal after boot, you can see the harddisk indicator is working, also can hear [...]

Why LCD will become yellow or red?
Using LCD certain period of time, especially always adjust to the maximum brightness, screen aging itself and the lamp will be yellow. Cold boot screen is mainly red lamp aging, you can replace it.