my pc164 has been having trouble recently, but i was more or less able
to ignore until lately.  over the course of the past few days, it has
spontaneously rebooted (or not, depending on whether it remembers the
srm settings that describe *now* to boot, even though the battery is
new) about 20 times (half of which required manual aid).

it sometimes stays up for a couple weeks, and sometimes only long
enough for me to type in two of the four required srm settings.  last
night, in fact, i watched via the serial console as it restarted three
times while at the srm prompt without me doing anything, after being
turned off for several hours.

there is a soft, barely audible click as it restarts, though i don't
think the power is the problem since i replaced that a few months ago
with a nice new 400 watt power supply (to power the two hard drives,
network card, video card, scsi card, cpu fan, and two other fans that
i added).

everything inside is cool to the touch, so it doesn't appear to be a
heat problem either.

has anyone else experienced this?  does anyone have any suggestions
for things to check to try to diagnose this problem?  i've had other
weird problems with this machine before (the serial console stopped
working after i typed "boot" for aboyut five months and then
mysteriously started working again), but this has me stuck.

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