Kevin Yang, connect an external monitor and see what you get. If it does display an image, angle your laptop LCD and shine a flashlight at an angle. See if you can make out any shadows displaying on the LCD. If you do, then you are having backlight issues. You will have to open your computer and check the LVDS connector, and the inverter circuitry. If all the cables and inverter checks out and if you have a display on an external moniotr, replace your LCD. If the external monitor does not display any image either, then you are having problems with the computers GPU circuitry. Let us know what you find. Hope this helps, good luck.