msumari, it could be the LCD, the CCFL, the inverter, or the video card. Start off by using an external monitor and see if your laptop is truly still working properly. If your external monitor works, it is most likely not your video card. If you angle a light against the LCD and you do see some shadows of your icons, just very dark, that means your backlight is out. This could be a bad CCFL. You can also measure the inverter with a multimeter (watch for the high voltage on it) The inverter is separate from the LCD and relatively inexpensive compared to replacing the LCD. Of course, you also want to make sure that all the cables are connected and that they are intact. Make sure that they are not broken around the hinges. To work on your laptop use [http://www.ifixit.com/Device/Dell_Latitude_D620#guideList|these guides.] Hope this helps, good luck.