A tutorial on how and when to replace a defective LCD Screen bulb or backlight.
Try to connect an external monitor if there is any signal. If there is no signal that means could be something with motherboard. Also re-seat your memory and power it again. If these suggestions do not work then it could be your video card. Now, if you have signal on the external monitor then it could be your? inverter or lcd bulb is bad... but please let me know so that I make additional suggestion