Screen is dark but image is present

I opened my laptop in order to fix a usb port that was functioning. Everything was going well until the end of the reassembling end. I was screwing a screw that holds the lcd connection to the motherboard. The screw slipped and touch two chips that were about 1/2 an inch away. A spark jumped out. At this point I knew I was going to have a problem. I finished putting it together. Pushed the power button, then i noticed that a didn't have backlight. Could it be the video card that I damaged or the backlight? Any assistance very appreciated.