I got my new 27" iMac a week ago, and pretty soon discovered that I couldn't get my USB sound interface to work properly with it. I get drop-outs and some clicks and pops. First I thought it was a problem with Logic, but as it turned out all applications act the same way. As I still have my old 2009 iMac I tested them side by side, and the interface works perfectly fine on the old computer. After calling Apple support a couple of times and coming to the conclusion it's a hardware error, they recommended that I get a replacement Mac. It will take a while estimated delivery date is October 31. So now I'm waiting, and a little worried that the new iMac will have the same problem. Has anyone had similar experiences? My interface btw is a Roland Octa-Capture.