Enterprise 420R Memory upgrade question...

I wish to upgrade/expand the memory in my 420R from 2Gb to 4Gb. I have a complete set of memory totaling 4Gb from another 420R with boot issues (to be resolved later). I remove all memory fro the ailing 420R, set aside, then remove original 2Gb from 420R and replaced with the 4Gb of memory. When booting the server, it still reports only 2Gb RAM (the "replacement" ram from the ailing 420R was reported correctly on that machine; I removed the memory riser card, still populated, and all MB RAM modules, and installed this into the "original" working 420R). Is there something in NVRAMRC or some other setting that needs attention in order for the system to see all 4Gb? FYI: I performed a "boot -r" after booting to the PROM screen first, but the system seems to "hang" during this, with the following Response:
{0} ok boot -r
Resetting...
SC Control: EWP:0 IAP:0 FATAL:0 WAKEUP:0 BXTR:0 BPOR:0 SXIR:0 SPOR:1
Probing Memory Bank #0 512 512 512 512 : 2 Gigabytes
Probing Floppy: No drives detected
Probing EBUS: Nothing there
Probing UPA slot at 1e,0 Nothing there
Probing UPA slot at 1d,0 Nothing there
Probing /pci@1f,4000 at Device 1 pci108e, 1000 network
Probing /pci@1f,4000 at Device 3 scsi disk tape scsi disk tape
Probing /pci@1f,4000 at Device 2 TSI, gfxp
Probing /pci@1f,4000 at Device 4 scsi disk tape scsi disk tape
Probing /pci@1f,4000 at Device 5 Nothing there
Probing /pci@1f,2000 at Device 1 Nothing there
The the system brings up the startup info (Sun's Logo, and...)
Sun Enterprise 420R (4x UltraSPARC-II 450MHx), keyboard
OpenBoot 3.31, 2048 MB memory installed, Serial #1515326
Ethernet address 8:0:20:e7:38:70, Host ID: 8-e72870
...and the cursor just sits there NOT flashing, no useable prompt. System appears to hang here and does not seem inclined to proceed further. Keyboard will not initiate a power-off, nor do any keys seem to work. If I initiate a power-off at the front panel switch, then a Power On from the keyboard, I get the same thing, and the system does NOT boot.
Any Ideas, anyone?? I am not very well versed in SUN hardware, but was "gifted" these systems (plus some drive arrays and a couple of 220Rs). I am sure these systems were fully functional when removed from service. I would like to use them as either Web servers or possibly as "File System" servers, for B/U and archive purposes.
Regards...
Mime Youngblood
mikey5555(AT)consolidated.net

haroldkarl,
just took all memory modules out for an "eyeball" and found the following:
All modules are "Samsung" from Korea.
2ea M344C1683DT3-C60C1 (0111 in upper right corner of label)
8ea M344C1683DT2-C60E0 (0035 in upper right corner of label)
6ea M344C1683DT2-C60E0 (0038 in upper right corner of label)
(this taken from the ONLY small square paper tag on one side of each module, the side without the 2 labels with barcodes)
These modules were installed in another 420R, and it reported 4GB in the "header" of the boot prom screen, while they only show 2GB in this 2nd 420R. Assuming these modules will work with each other, is there a preferred order or "pairing" of these slightly disimilar pieces?
I did check for fully seated modules b4 removing, but did not find any that were obviously not seated well.
Regards...
TexasMike
mikey5555 AT consolidated.net

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