I installed a quite new Fujitsu 2.5" 60Gb drive to my 1200 1.D4 with Blizzard 1260. I also have a 4xEIDE buffered interface connecting the hard drive to the IDE header. This set up exhibited the same weird crashing as you experienced (total system lock up, mouse pointer stuck and no Guru). I think I've nailed it down to the Elbox 4xEIDE.driver software. I cut this out the startup-sequence and I've had no freezes from cold or otherwise for now. I think it's strange that this should be the case but it seems to be so.
