I just got a set of Altec Lansing multimedia headphones. They were about $40 at Best Buy. I got them for listening to music late at night and for practicing late at night. I tried them on my computer and they don't sound right at all... very little low end, and it distorts if I crank up the preamp in Winamp. If I use it on any other computer but mine, they work fine and sound great. It's almost as though the signal coming from my computer is too weak. I've got the volume control in Windows turned all the way up. Any ideas as to what could cause this?