hp g6 2304AU won't turn on.

My hp one day just suddenly wouldn't turn on. 

When I try to turn it on the wifi button blinks once orange and then nothing else happens, sometimes the cd disk drive would flash green aswell. 

I've tried hard resets and when i put the laptop on charge the white charging light comes on and when i take the battery out and connect the adapter the light turns orange. 

Does anyone know what this means ? 
Thank you.