As I understand it, there is a known issue with some of the motherboards - sorry, formatters - on the Z3200. Mine failed (I was told it was a HD issue) and needed to be replaced. A new one was sourced rapidly - interestingly, it was an older version with a slightly older Hitachi hard drive. On the plus side, I got great support from HP, and changing the formatter on the Z is a piece of cake. OK, at least, it isn't that hard. All the related issues have been resolved now. Which isn't to say the Z runs predictably all the time, but it's pretty damn good most of the time.