so put the new drive on and rebooted, pdmode 0, layerpmode off and still doing it.  Any cant draw with the hardware acceleration off because if I remember right when you make a section using the fabricarion section tool in model space you don't see everything.  I don't get it I wonder if it has something to do with xref in fabrication plumbing and pipe in to the ductwork drawing and it trying to refresh all that information.