KT4V-L - onboard sound problems, any suggestions what could cause this

Board and system (winXP and xp2400+) set up fine.  The only problem is with the sound. Every now and then i get a horrible screeching sound out of the speakers (a bit like feedback).
This is only intermittant, last night it ran for 4.5 hours and only 'screeched' once for about 5 seconds.  It doesn't seem to be the speaker (it happens on different ones) or the speaker connections (i wiggle them around but can't reproduce the noise).
At one point they were bad so i closed down and whilst it shut down the noises actually increased.
Are there known problems with the onboard AC97 sound.
Can the PC-Cillin cause sound problems?  Any suggestions greatly appreciated as the answer i got is to try a soundcard  - which i hope will fix it.
thanks
Doc

thanks Asaf
to be honest i can't recall - i have ahd a mic attached but don't think it was everytime i had the noise
in any event - surely it still shouldn't make a noise like that anyway
just got a cheap (£4) Soundblaster 128 so will try that
cheers
Doc

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