Computer not powering on. Faint green light on magsafe charger

Recently, after a night of not using my Macbook Air, it will no longer power on. The MagSafe charger has a faint green light when plugged in. Also when the computer is plugged in the is a faint ticking noise within the computer. I have tried multiple magsafe chargers. I have also disconnect the DC in board and re connect. I fear that either my motherboard or DC in board needs to be replaced. Does anyone know if there is anyway to tell 100% what is wrong with my computer.

Thanks a ton.