I'm running an HP dv6000 laptop w/vista home,I use the computer for a lot of media,I have it hooked through the 3.5 sound jack and also s-video jack.My problem is that I get feedback on surround sound and i can see it on TV screen.When I unplug laptop from AC and it runs off battery everything is fine.I bought an AC filter thinking that it would filter AC power/feedback but that hasn't worked either.HP tech.support no help either.One of my friends has a newer HP dv..... and it has a filter looking thing on the AC cord I've tried that also,no luck........any ideas?