
I have seen that happen on motherboards that have been 
damaged or tampered with in some way...  Some sound cards 
have inputs from the motherboard PC Speaker port that connect 
to a place on the Sound card.  That is used to route the PC 
Speaker sounds directly into the sound card.

On Thu, 04 Jan 2001 12:14:42 -0600 "Chad S. Lauritsen" wrote:

> Hello all,
> 
> I have a user whose computer (win95) is emitting a siren 
sound
> periodically from the system speaker (the one plugged into 
the
> motherboard).
> 
> at first, i dismissed it as a noisy fan, but she was persistent
> and made
> me come and listen to it. it is not a fan, that's for sure!
> 
> she has a sound card, but no speakers attached to it, i don't
> think that
> windows even has the drivers installed. i do know it's coming 
from
> the
> system speaker, because i unplugged it and it stopped, and 
then
> started
> again when i plugged the speaker back in to the motherboard.
> 
> the sound starts and stops without any deliberate intervention.
> i'm
> going to look to see if there are any trojans, viruses, etc. that
> are
> known for doing this. I'm don't know how one gets an analog 
signal
> (other than beeps) to come out of the speaker header on the
> motherboard,
> though.
> 
> Has anyone encoutered a similar situation? The sound 
sounds like a
> pre-recorded siren sound, like you might hear on a toy 
firetruck
> or
> something. it even sounds like it has background noise/hiss 
in the
> "recording." Weird. got me baffled.
> 
> -- 
> Chad Lauritsen			  | 1000 N 2nd Ave
> System Administrator			  | Logan, IA 51546
> Perfection Learning Corporation	  | 712-644-2831 Ext 223
> 
> Mairzee doates andozee doates anlitta lamzee-divee
> A-kiddalee divee too wooden-choo.
> 
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John Dietz
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