2-Tone Sounds.

[Lionel Beck]

I'm experiencing frequent 2-tone sounds. NOT beeps, but tones. On a musical scale, something like E-G, G-E. Often every few seconds. It's like someone sounding a 2-tone car horn (down-up, up-down). Every time the sound occurs, the icons in the task bar jump about. Whether or not I'm engaged in some computer activity, they still occur. In every other respect the computer is behaving normally. (All drivers are up to date). Up-down tones are not necessarily followed by down-up. Sometimes there are repeated instances of the same double-tone. I'm baffled. Anyone any ideas, please.

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