High pitch noise till battery is charged more than 60%. Thinkpad connected to power battery charged less than 60% High pitch noise also when HD is powered down. Thinkpad connected to power or working on battery, also when suspended to RAM Strange noise like a rapid series of very short high pitch noises adding to a constant kind of whistling (only as long as the movement goes) ThinkPad connected to power and switched off, with battery fully charged Plugged into AC / running at high CPU frequency Noises have been experienced in the following situations: However, there are those with "bat like ears" that hear them and might be annoyed by that. The noises are of low volume and hence not realized by everyone or at least tolerated by most people.
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