On Dec 15, 14:09, Douglas Quebbeman wrote:
> > On Dec 14, 16:16, Douglas Quebbeman wrote:
> >
> > > In particular, do any of you have familiarity with
> > > systems that flash the on or power light as an
> > > indicattor, sopecifiecally, of a power supply
> > > problem?
> >
> > The only thing I can think of that's *designed* to do something like
that
> > is an SGI Indy; if you power one up and it can't even run the the code
in
> > the PROM, it flashes the power light (which is a two-colour LED). The
> > usual cause id that there's no (recognisable) RAM at all in it.
Probably
> > not relevant to a PR1ME.
>
> No, I'm afraid you may have hit it on the head, and it's been the
> direction I've been leaning, that the microcode ROMs may have
> fried, but that just blows my mind.
Possible, of course, but in the case of an Indy, the processor and PSU are
working, and it gets only as far as the "I think, therefore I am a
processor; I wonder if I have any memory" test in the PROM, and then
executes a loop which controls the LED in the PSU if there's no RAM. At
least, that's what I believe; I've not seen a detailed description of the
PROM startup. I suppose your problem may be something similar, in that the
CPU is running but can't do anyting useful because either it's crippled or
some other part of the system is disfuntional. Does the CPU control the
power supply LED(s), like it does in an Indy?
--
Pete Peter Turnbull
Network Manager
University of York
Received on Sat Dec 15 2001 - 14:58:43 GMT