6 did nothing for me, but 7 actually did the trick.
@anarcat, I suggest trying 7 again. If it still doesn’t work, I’d strongly suspect your ram module is bad.
(At least, I think it was the ram module–it was pretty much the only thing that wasn’t screwed in place, and had two thingamabobs, one on each side, that when pried away gently, allowed it to hinge upward; the module itself had four chips on it.)
@anyone else: The mechanism (thingamamobs) that holds the ram module IN is not proof against having a padded case tip over from a height of something like 75 cm. Now that I think about it, I had my carrying case tied to the top of a tip-over-prone wheeled carry on bag, and it fell over in the airport at my destination. That was apparently enough to jostle the ram module loose. I could very readily imagine it working loose during shipping if boxes are tossed around casually by the shipping companies.