Macboo k Air 2010 not turning on?

hello my mac book air 2010 just went black screen, won’t turn on, no fan moving and not light on keyboard ect. But the charger green light is on when I charge it. Why isn’t it coming back to life? I opened t up and unplugged the battery and tried to reboot it with power source of the mains but no luck? Not sure what’s wrong it looks clean inside?