Yes, I primed them – i.e., sucked out the air until some ink flowed into the syringe.
Yes, it performed such a sequence, though I'm not sure it took that long (maybe it was incomplete and should be repeated?);
No, can't see lines – With top cover open I can't see the actual lines on 3880 (nor on the P800 sitting next to it).
Tried to print a page via Quadtone RIP and it went through all the sounds and motions of printing – and again produced a blank sheet. So I guess no ink is reaching the head.
Hey, it's already the end of the day here in PST. You're allowed to go to bed now, and I'll be here to work on this tomorrow!?
PS, I should add that the bar graph for ink levels does show all channels full.