B. Wright wrote:
> Yeah, you disloged the memory or the backplane enough to cause a
> problem. Have you checked both of those? I dealt with a lot of 420Rs
> and sometimes had problems with this just when people moved them from
> rack to rack. The connecting system for that backplane doesn't seem to
> be the most reliable design and if I remember right it was also
> connected at least partly to the CPU cage as well, you could have
> disrupted it just by pulling the CPUs. There are some screws holding
> the whole CPU cage down, make sure those are tight, also the two wacky
> screws on the memory backplane. You're supposed to use a torque driver
> on these according to Sun and there might even be one stashed inside the
> machine, but if not careful hand tightening is probably ok.

This is probably something like what happened. Running on a single CPU,
I pulled riser board and retightened all the CPU bracket screws then
replaced it to no effect. I then pulled half the memory and it booted
up ok. Probably a loose connection on one of the memory sticks I guess.
Unless one of them went bad.

> I don't know why they actually split each bank across that
> backplane instead of making two banks on the main board and two on the
> back plane. If they had done that, at least you could have ripped out
> the backplane or not even used it if you didn't need the extra RAM.

Yes, I noticed this as well. Rather dumb design, I'd say... But then,
there are plenty of examples of that in the e420r.