98% of the time the motherboard is grounded by virtue of a screw that goes into
a metal post that, in turn, screws into the case.  Of course, this presumes that
the case is properly grounded, which leads to the question of whether the outlet
into which you have the computer plugged is properly grounded.

And I would rather suspect a cheap power supply than the motherboard itself,
although it could be either.

Roxanne Pierce
R2 Systems, San Diego
mailto:[log in to unmask]

> -----Original Message-----
> From: Arif Ullah
> Sent: Friday, March 27, 1998 09:07
>
> I am starting to doubt the motherboard. I've tried two
> different sets of speakers with same result. Besides,
>as I mentioned earlier,  the sound card works fine after
> that particular noise. But, now I've noticed that a
> humming noise starts to come out of the speakers after I've
> used the PC for an hour or so. I've tried the sound card
> in a different machine and it works fine.
>
> I don't know if this is possible but I was wondering, may be a small
> amounts of electricity is passing to the ISA slots of the motherboard
> (Shuttle Hot 569) at power on and causing the sound. Is there
> any way to ground a motherboard?