Hello everyone. I have a Dell Latitude E6410 laptop, which I bought it as a used laptop. Last week, while I am using it to browse websites, it SUDDENLY shutdown, then I try to turn it on again by pressing the power button, but it doesn't turn on. I look at the power adapter, it's green light is FLASHING. When I disconnect the power adapter from the laptop, the light on the power adapter is STEADY green. As soon as I connect the power adapter back to the laptop, its green light is FLASHING again. I also tried to turn on the laptop by using the battery, but it doesn't turn on. There is NO sound or light on the laptop at all. What's wrong with my laptop, is the motherboard dead? Sorry for a long message. Thank you very much for any help.