I built my own pc about 5 years ago and upgrade certain parts now and again. I bought a new widescreen flatscreen monitor, only to find out that my old video card didn't support the widescreen mode (although it still worked fine for none widescreen modes). Anyway, I only have 1 AGP4x and my local shop only had AGP8x so I bought a PCI video card. It worked fine and supported the widescreen modes perfectly. But then I tried watching a high quality video and the audio was distorted and clicky (it doens't happen with low quality video). I did some research and it seemed like it was a problem caused by IRQ sharing (the video and sound cards, plus a few other things all shared IRQ 5). After trying lots of different things to change the IRQs, I finally managed to do it by disabling my mobo's onboard COM, Parrallel, Midi and game ports. This resulted in my Video card moving to IRQ 11. Unfortunately this didn't solve the problem at all. I even tried moving the Video card to a different PCI slot, because it was right next to the sound card and I thought maybe this would cause electric interference, but that didn't work. The IRQ for the video card is still shared, but only with OHCI Compliant IEEE 1394 Host Controller (somat to do with my network card i think??), and the sound card's IRQ is still shared with SiS 7001 PCI to BUS Open Host controller, however, I can't see that it's really an IRQ sharing problem. I also tried lowering the screen resolution, and trying different media players, but no help. This problem isn't just with playing high quality video either. I was playing music on my media player whilst looking at a huge jpeg image in a browser, and when I scrolled down the image, the same distorted clicky noise was heard. (So basically, graphically intensive operations have an adverse affect on sound quality). Any help would be muchly appreciated! Here's the relative specs: ECS Elitegroup My mobo is a K7S5A Creative SB Audigy PNY Geforce 6200 256mb nVidea and a Kensington Value Mouse.