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High pitched tone from PC box

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The3rd Earl Of Derby The3rd Earl Of Derby is offline

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High pitched tone from PC box

wrote:
My PC (Dell Precision 370, about 14 months old) is emitting a high
pitched tone; I'd say between 8 and 12 KHz but that is a guess; that
guess based on recall of acoustic-coupler modems. Loud enough to be
annoying; hardly loud enough do much about.

It is not the (19 inch flat analogue, not CRT) screen and I have
isolated other items like USB disks.

Reluctantly, I switched the machine off and the noise disappeared. The
machine has been switched off only once before; not green, I agree,
but I don't like switching off critical machines.

A transformer or other power supply part?

There may be a momentary slight modulation of the sound when the
screen changes, hence the initial suspicion of the screen.

Laziness, I agree, but I'm putting off dismantling everything and
opening up the box; and given the frequency, it will be difficult to
pinpoint anyway.

TIA,

Jon C.

If your not willing to take out cards,disconnect drives, ect then you're
not going to eliminate the source.

--
Sir Benjamin Middlethwaite

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