Strange sound problem on K7T Pro2-A

Hello,
I have this problem with my onboard soundcard (playing mp3's, cd's, ...):
at normal speakerlevels i can't hear any music, but if i turn my volumeknob way up, i can hear it very faintly.
I checked everything i could think of: the speakers, cabling, volumesettings, reinstalled drivers (soundcard is still detected by WinXP), installed the Audiodrivers from viaarena.com, checked biossettings...
This problem started when i (temporarily) changed my floppydrive for a Zipdrive. I changed the bios just to get rid of the error there's no floppydrive, but nothing else.
I left my case open after i placed the Zipdrive, and because i read on this forum there were some issues with onboard sound & grounding, i closed it again, but to no avail. Now i'm running out of idea's.
Any help would be appreciated.
short specs: MSI K7T Pro2-A/AMD TB 1GHz/256MB/40GB + 20GB/Geforce256/CDRW48-12-48/DVD6x
thanks in advance,
Sven

I have a K7T  Pro v.1 BIOS v.3.0, Duron 1200 Mhz with VIA 4 in 1 v.4.38.
i have had some serious problems recently, including the death-led's. After reading the thread in the old forum about the problems with the MS-6330 series I'm getting pretty nervous about the future of my poor MB.
But what i've been wondering about is wether these problems might have something to do with the AGP port and using heavy 3D graphics. I have read that several users have provoked failures when using 3D-screensavers.
My problems seemed to start when i installed an MSI G2mx400 AGP card (replacing a Cardexpert SiS 6326 8Mb PCI card). Using the DirectX Diagnosis tool (v. 8.0 and 8.1) my machine crashes on the 3D-tests. I've also tried an ATI Rage 128 16Mb AGP card with both Win2k and WinXP with exactly the same problem.
After finally getting the four red-leds I tried replacing the CPU with a Duron 600Mhz, but nothing happened so I guess the advice about doing that somewhere earlier in this post doesn't always work... Eventually i managed to wake the system by shorting the CMOS.
After this rescue I have replaced the AGP card with my old PCI card and it seems to be working fine so far. So after all I've been reading about the bad/overheating chips and capacitators and so on, I'm thinking maybe the AGP card could be one of the causes of this?
It would be interesting to hear if anyone has experience with the failure rate of AGP vs PCI...

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