280R won't boot

I'm puzzled with one of my 280R's that of course is just out of warrant.

This machine has been turned off for about 6 months. I'm now trying to
bring it back online for a project. As far as I know, it worked great when
it was last running. Now when I try to power it up, this is all I get on
the console.

CPU seeprom format: 0000.0000.0000.0002

A few google searches showed others with the same problem, but I was never
able to identify a solution. When booting in diagnostic mode, this is what
I get. I have tried reseating everything. I've even removed everything but
essential components, all to no avail. I'd really like to get this machine
running, but it may be a lost cause. You are my final hope.

rsc> console
Done
Setup TLB Done
MMUs ON
Block Scrubbing Done
Copy Done
PC = 0000.07ff.f008.5970
PC = 0000.0000.0000.59e8
Decompressing Done
Size = 0000.0000.0006.fd20
ttya initialized
Start Reason: Soft Reset
Fatal Error reported by:
No JTAG information available
Probing gptwo at 0,0 SUNW,UltraSPARC-III+ (900 MHz @ 6:1, 8 MB)
memory-controller
Probing gptwo at 1,0 Nothing there
Probing gptwo at 8,0 pci pci
Loading Support Packages: kbd-translator
Loading onboard drivers: ebus flashprom bbc power i2c dimm-fru dimm-fru
dimm-fru dimm-fru nvram idprom i2c cpu-fru temperature fan-control
motherboard-fru ioexp ioexp ioexp fcal-backplane
remote-system-console power-distribution-board power-supply
power-supply rscrtc beep rtc gpio pmc parallel rsc-control
rsc-console serial
CPU 0 set ambient power off temperature to 70 degrees C
CPU 0 set junction power off temperature to 110 degrees C
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