Over the last couple of weeks my xbox has started to make a strange noise during the course of playing files, usually leading to freezing during play. I use my xbox predominently for my XBMC. It basically sounds like its working hard to load creating noise akin to "kachum-kachum-kachum kachum-kachum-kachum kachum-kachum-kachum" in long loud sets of threes. I opened it up thinking perhaps the ide cable might be loose but they are perfectly tight. Maybe i need a new laser but i have no idea. My system is chipped. The last it happened the sound continued even AFTER i shut my xbox off!