--- Jeff Walther <[EMAIL PROTECTED]> wrote:
> Pull the motherboard. Remove the heat sink. Clean
> the CPU chip
> (gently) with rubbing alcohol to get the white heat
> sink compound off.
>
> Now hold the board at an oblique angle to a light
> source and check
> for cracks in the ceramic area of the CPU around the
> metal die in the
> middle. A not uncommon failure mode for the x100
> series is for the
> 601 CPU to simply crack.
>
> If you don't see any cracks, then clean the heat
> sink compound off of
> the heat sink as well, reapply new heat sink
> compound (available from
> Radio Shack in a little blue & white tube for about
> $2) and hope that
> your problem was overheating and that the fresh heat
> sink compound
> will solve it.
I will try this. Do you have experience of a similar
fault which was caused by a cracked CPU? What is the
brand of heat sink compound? Just a shame the 601 is
soldered to the motherboard...
> The ROM slot and cache slot are interchangeable, so
> you might try
> putting the ROM module in the cache slot and leaving
> out all the RAM
> and the cache and see if that helps. If the
> machine chimes, you may
> not be able to boot with only the 8 MB on the MB,
> but at least you'll
> have narrowed down your problem.
>
> Jeff Walther
>
I have tried swapping slots. The machine doesn't have
a cache card installed - this was made redundant by
the backside cache on the G3 crescendo. I tried the
ROM card in my 6100 which uses the same card and it
worked fine. I also tried swapping ROM cards - no
dice. There is no RAM installed.
The machine doesn't get to the boot stage; it doesn't
even seem to run a POST. I've had Macs die before, but
not like this. It's like the motherboard isn't even
getting power, but I've checked this (as much as I
can).
I do wounder if this has something to do with the PDS
terminator. I've heard that it can damage the
motherboard on the 8100 if there is no card in the
slot and terminator is absent.
Happiness is the exercise of vital powers along lines of excellence in a life
affording scope.
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