>Since early on , from time to time, the computer (I think the motherboard)
>kind of whistles. Sometimes long ones, at other times short. There was a
>period of a month or two, without noise.
>Yesterday it started again, almost non stop.
>I suspected that it might have to do with the CPU temperature, but it seems
>to whistle when its cold or hot.


    Have you checked the fan(s)? Likely culprit.

-Peter Ramins

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