I had my computer off all night, get home from work, turn computer on and I started getting this noise. It does the same thing on another computer as well as with different cables. Optical doesn't do this so I'm assuming something's funky with my USB board. I had this issue once before like 4-6 months ago and I can't for the life of me remember how I got it to stop doing it. I think it was just a matter of unplugging stuff and plugging it back in but that apparently isn't working this time. Any ideas? I bought it from a member on head-fi like 3-4 years ago. Pretty sure it's out of warranty, I bought it used too so that doesn't help.