Diagnosing a non-working Mac Performa 476?

From: Brian Chase <vaxzilla_at_jarai.org>
Date: Tue Jun 4 00:20:33 2002

On Mon, 3 Jun 2002, Christopher Smith wrote:

> Would you believe that the whole thing may be working? ;)

Well, I'd be very happy.

> First thing to do would be re-initialize the "parameter RAM." Hit
> command-alt-p-r on power up. (I have seen corrupted PR cause this
> kind of problem.) There are also a couple of things that you can
> (very safely) reset with other hot-keys. You'll have to look them
> up, though.

I've a feeling it's most likely the PRAM battery. I'll try finding a
replacement. Someone mentioned a CUDA switch on the motherboard for
clearing the PRAM, but the closest thing I can find is an unidentified
pair of jumper pins in rough proximity to the battery. I tried the
command-alt-p-r thing with the existing batteries without luck, but
then there's no Alt key on this particular keyboard (Apple Keyboard II).
It only has command, ctrl, and option meta keys. Once I find a
replacement battery, I'll poke at it again to see what happens.

Thanks to everyone for their advice, I'll followup with my findings
(and possibly more questions) as I progress.

-brian.
Received on Tue Jun 04 2002 - 00:20:33 BST