For the record, I haven't been able to reproduce it now. (I have opened the box to verify connections and so on; and to be exhaustive, the only modification was to simply move a IDE loose end cable further from the motherboard---I always wonder, with the increase of speed, what the electromagnetic noise impact is, and how shielded are MB components from such perturbations...).
-- Thierry Laronde <tlaronde +AT+ polynum +dot+ com> http://www.kergis.com/ Key fingerprint = 0FF7 E906 FBAF FE95 FD89 250D 52B1 AE95 6006 F40C