My Sony Vaio is not turning on or charging what so ever. I've replaced the battery but to no avail. Pressing/Holding the battery reset button as well as the assist button doesn't do anything. My A/C Adapter seems to be functioning, however whenever I unplug it, the green light on it sticks on for a minute before fading away; not sure if that's normal. I'm thinking it could be the motherboard. When I opened up my laptop, there was barely any dust inside it. Any possible solutions I should try before going to a repair shop?