Re: Main memory modules reported as faulty

[Roberto José Etcheverry Romero <yggdrasil.raiker@xxxxxxxxx>]

Are the memories in the correct slots? Look for the "Memory placement
rules" PDF and you will find the correct slots to populate with memory and
depending on if it is Power5 or Power5+ I think one only allowed Quads
instead of Pairs, after the base Pair.
If both memory sticks were damaged the system would not even IPL. That
machine MIGHT have been managed by an HMC, by any chance does the front
panel (where you see 01 B N and the SRCs while IPLing) show HMC=0? If so,
you would need to clear the Flexible Service Processor config to get it
back into stand alone mode. It might be that it has an LPAR and that
consumes all the RAM.
It might also have been configured with the old DST-based LPAR manager but
I barely remember how to check that.
Can you post the SRC's you see in the DST's Service Action Log?

On Tue, 30 Dec 2025 at 16:55, midrange.s6qdx--- via MIDRANGE-L <
midrange-l@xxxxxxxxxxxxxxxxxx> wrote:

> Hi all,
>
> First of all, I'm somewhat new to the AS/400 world, and just a hobbyist,
> so forgive me for any inaccuracies I might provide.
>
> I recently acquired an AS/400 model 520-9405.
> Everything worked fine, except the system was showing a suspiciously low
> amount of main memory (about 384M). SST in fact reported the 2 main memory
> modules as not working.
> I opened up the case and realised one of the fans had been removed,
> probably because being faulty, so I purchased a new one along with 4 sticks
> of new ram of the same type/part id.
>
> After re-IPLing, SST is now reporting all 4 new banks as not working,
> while the old 2 banks are still there and reported as not found.
> I'm wondering now what could be the problem here.
> I'm now hoping that the fan removal triggered some sort of "safety system"
> that disabled those slots, and there's some procedure to "reset" ram
> modules, but I'm more worried at this point that the fan removal actually
> damaged the motherboard and so I'll be out of luck.
>
> Any hint is very much appreciated,
> Thank you and happy holidays.
>
> M.
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