What you are looking for is called an "Inverter" You are looking for around $50 dont pay much more than that. Now sometimes when an Inverter goes bad, it also burns out the bulbs that give the back lighting of your LCD Screen and those costs $50 as well. So if you are tech savvy enough, you can purchase the Inverter and Replace it yourself. Do a google search and you can find the specific model for you laptop. They are easy to remove from a laptop but let me warn, you that you make sure the battery is removed from your laptop and the laptop is not plugged into an AC outlet.