en.community.dell.com/.../19659477
This problem has been pointed out in previous posts (link above)
Dell just replaced the main board of the unit but the problem still exists.
I just also noticed that this noise issue only occurs when the main unit is connected to the keyboard dock.
When the two units are separated, this annoying noise immediately stops and I no longer hear any buzzing sound.
With that said, has anyone tried replacing the keyboard dock unit?
I doesn't seem like it's coming from CPU which is located on the top side of the main unit. This sound seems like it's coming from the very bottom of the main unit of from the keyboard unit.