I'm still trying to track down my apparently intermittent memory issue. I stressed my PB to get it running hot, so I could test the memory (to see if heat was an issue.) But I got a kernel panic before I could shut it down nicely. And of course, memory tested OK when I restarted with Apple Hardware Test disc. I've been doing some research using google, but haven't found anything specific on heat/memory issues. I'm looking for a working hypothesis, if anyone has one. I'm wondering if I should send the memory back to Small Dog. I'm not 100% convinced it's a memory issue, but everything else checks out OK. John Lyon US Stress Level: Orange