In 1998 A customer of mine had a whole batch of Dells who all had the same problem that the second IDE port didn't work. No problem as long as you kept the machine as you received it, but it became a problem when I wanted to add cdroms. As the whole batch had the problem they should have known about it. But instead they tried to make life difficult for me: "have you tried that? Didn't you make that mistake?". It paid of for them. I got so sick of it that I only asked replacement for those computers where I actually needed 3 IDE devices at that moment. But in fact the whole batch (some 15 computers) was bad.