When you’re hard at work, and you just finished saving, is the worst time, to loose visual of your screen, even if you’re just starting your work, it’s a bad time. If your laptop screen is dark, here’s a helpful trick to figure out what the problem is. On the side is a blue VGA port, just like what you have on the back of your desktop. Take a monitor cord and plug in a monitor to your laptop. If you get a picture, it means your laptop screen needs to be replaced, pricey, but if you don’t get a picture, it’s your video card instead. Replacing a video card can be less expensive. These tricks can save you the cost of a diagnosing fee at the best Sherman Oaks computer repair shops.