Noise during charging

An intermittent noise has started during charging, it's a high pitch hum or whine, not real loud. Is this something I should be concerned about? I have had the plug (where it connects to the powerbook) smoke several months ago and had it replaced by Apple. I do not recall a noise at that time.
powerbook G4 Mac OS X (10.3.9)

Same computer, same problem. This just started in the last couple of days, accompanied by another, presumably related issue. When I plug in the computer, it charges fine until some point -- when the brick in the power cord gets too hot? -- it quits charging. If I detach the brick from itself and reattach, then it will start charging again, for a few seconds. So far, the only solution has been to let the brick cool and then I can charge some more.
I'm not sure if the whine is caused by the powercord/brick issue, or vice versa, or something else entirely.
Thanks for any help
EE
G4 Tower, 15 Powerbook G4 Mac OS X (10.4.9)

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