My HP Pavilion dv6 will not power up, acknowledge the fact that it is plugged in, nothing. It won't do anything at all. It's like it died. It was working fine earlier. I turned it off to go to town, come back and it will not do anything. No lights on for charging, nothing. I've tried the 30 seconds without cable or battery and then replacing them. Nothing works. I don't know what to do. Please help!!