I have a Studio 1537, and the DVD drive has stopped working. When a disc is inserted, it sound like its being chewed up, and the drive makes a "click-click-click" sound on startup and wakeup. I'm pretty sure there's not an OS/driver fix for this kind of thing, but I can't find any information on a replacement drive. What are the specs for the drive/where I can get a replacement? The Dell parts locator will only show me hard drives. Is this some kind of unreplaceable integrated drive?