I have a 17" UMBP hooked up to a 24" Apple Cinema Display (MDP and USB), and then I have a Logitech 2.1 speaker system hooked up to the MBP. My speakers "pop" randomly. I have no idea what's causing this. I'd assume it's the MBP, but I'm not sure. Any ideas or anything to try? I unplugged the speakers for a bit but the 24" Cinema Display speakers SUCK (relative to the Logitechs).