Dead SS20 NetBSD machine

[Greg Earle <earle%isolar.DynDNS.ORG@localhost>]

(Yes, I know this isn't a hardware forum.)

My NetBSD/SPARC 1.4.1 (yes, that's not a typo) machine, a faithful  
SPARCserver 20 which has served yeoman duty for me as a front-end  
SpamAssassin filtering system along with the occasional Web serving  
use, appears to have bitten the dust suddenly.

I woke up to find the light stuck on (I use "options BLINK") and the  
system unresponsive.  Usually a power-cycle gets it out of its torpor  
but today was different - it turns on, the CD-ROM drive light blinks,  
I hear the fans, but it doesn't even show POST in the console window.

Is it more likely to be the CPU module (it's got a HyperSPARC 125 MHz  
CPU) or a dead motherboard?

I'll likely not resuscitate it, but it would be nice if I could at  
least get it back on to do a final set of level 0's and then dispense  
with it (I'd probably just give it to a Los Angeles-area person from  
this list).

        - Greg