Btw, here's the instruction page that support pointed me to.
http://h10025.www1.hp.com/ewfrf/wc/d...reg_R1002_USEN
Very trivial steps, except in Step 4 where it says "Step 4. Attach the power and flat ribbon cables to the rear of the drive." That would be simple also, except THERE IS NO SUCH CABLE in the computer!!!!!!
The support person says that they have designs among the best in the industry and win awards, so clearly it's not a problem with the computer. I might agree -- the problem is that there is not the basic info, and that the cable is missing and that the other cable is too short, and that the whole arrangement of the cables is stupid and doesn't work. Other than that, it's a stunningly wonderful design. Ugh.
I had better leave it at that before I say something about HP and HP support that I shouldn't say!...