Hello,i recently bought Asus r510jk and i dont know if this problem started tonight or it was from the begining.When the laptop is off and connected to power it makes a kinda low pitch sound and sounds like something its running inside,but if i power it everything its ok. But if i remove the power from laptop the AC adaptor starts making some clicks sound. I am woried and i dont know what to do,it is normal? or i should send it back?