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James Noyes · Guest

I have three Netra AC200's, only one of which is working.
I'd like to see if there's any way to salvage the other two.

The two that are dead both behave the same - when plugged in, the
wrench/fault light blinks three times. The lom comes up fine and is
responsive, but the system refuses to power up. I tried "powerup" from
the lom prompt and using the power switch on the power supply itself. No
luck.

Using the good machine as a donor, I've been able to determine that the
problem is definitely somewhere on the mainboards. Switching out the
system configuration card and reader, the power supply, the CPU, the
NVRAM, the memory, or the disks with the good system does not change the
behavior of the dead ones at all. I've checked the jumpers, and they're
identical on all three systems. The only thing that changes the dead
machines' behaviors at all is closing one of the two jumpers on the board
related to "debug" - this makes the wrench light not flash, but the lom
also doesn't come up.

Apparently this failure mode is somewhat common, as I've been able to find
about half a dozen examples of other people with identical symptoms
through google. Unfortunately, in none of these cases has anyone managed
to find a fix, or if they did, they didn't bother to share it.
Some examples:
http://forum.java.sun.com/thread.jspa?threadID=5112333
http://www.tutorials-be.com/sunhardware/Netra-blinking/

Before these machines end up consigned to the scrap heap, can anyone
suggest what might be required to get them back from the "dead"?

Replies in-group are fine, I'll read them.