Does the Charger have a three prong power plug?
According to the manual it does.
There is an adapter available at hardware stores to change a three prong power plug to a two prong plug. (it disconnects the ground pin) it costs about $1.
Try disconnecting the third prong with the adapter. This will lift the ground from the computer.
The noise might be caused by a ground loop. This happens when the TV is grounded (to the cable TV) and the computer is grounded, at the same time.
Disconnecting one of the grounds stops the problem.
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