Laptop AC adaptors, while generally very quiet, do emit a small amount of noise. Generally, this noise is within the parameters of the adaptor's normal operation, but variance of the sound or new noises may indicate a malfunction.
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A high-frequency sound from the AC adaptor is normal. The sound may often be too high-pitched or too quiet to hear, though it may increase in volume after long periods of connection.
Some adaptors come equipped with an internal sound, often a consistent beeping, to warn the user of incorrect operation. Adaptors acting in this way may not supply power correctly to the laptop, and should be replaced.
While some noise is normal, a sudden change in the consistency or type of noise may be indicative of a problem. A snapping sound, for instance, can accompany an electrical problem. Adaptors displaying abnormal noises should be repaired or replaced, as damaged adaptors pose a risk of electrical shock.
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