Summary: Had this for about a year now. As a PC, it's fine. No problems. Never let me down. Just one problem; it rattles. Or hums. Or buzzes. Whatever; it is soooo annoying. And it's not even consistent; the tone changes all the time. Looking at forums, this is not unusual. Dell's advice is to tighten the screws. Shouldn't they have done that? I've tried, and it still buzzes. I've kind of got used to it now, but it's not something I should have to put up with.