Undefinible noise on the top left corner
first of all, my english is not very good, I sorry for that.
My MacBook Air 13" Mid 2012 makes undefinible noises on the top left corner. It seems like every 3 seconds a few tickles (knocks) appearing. In every situation, with/without power supply, with/without playing sounds, with/without active fans.
Does anyone know the reason for my problem?
Is this a good question?