Iphone 4 makes an continuous intermittent vibration/buzzing sound when plugged into any of computer's 3 usb ports; does not show in itunes or Windows Vista device manager. No problem charging the phone with other power sources. What's going on?

This problem happened intermittently in the past but now happens every time I plug in the phone. I suspect it might be a problem with my computer, an Acer Aspire 4530, perhaps with it's charging function via usb ports? The phone makes the same buzzing sound twice when I connect to other power sources, but continues when connected to computer. I have this issue even when the phone is 100% charged.

This problem happened intermittently in the past but now happens every time I plug in the phone. I suspect it might be a problem with my computer, an Acer Aspire 4530, perhaps with it's charging function via usb ports? The phone makes the same buzzing sound twice when I connect to other power sources, but continues when connected to computer. I have this issue even when the phone is 100% charged.

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