Troublesome Sawtooth 2

[John McGibney]

Try the PRAM battery. This was a known sign of dead battery on some models.

John

on 11/25/02 8:10 AM, Power Macintosh G4 List at G4 at lists.themacintoshguy.com
wrote:

> 
> Date: Mon, 25 Nov 2002 11:43:11 +0100
> Subject: [G4] Troublesome Sawtooth 2
> From: <csean at poc.it>
> Message-ID: <BA07BD4F.4D47%csean at poc.it>
> 
> Some new info.
> 
> Though the Sawtooth was diagnosed as having a bad processor, the techs who
> did it weren't too thorough.
> 
> I swapped the processor into another Sawtooth and it booted fine. So
> obviously not the processor.
> 
> Back to the testing bench.
> 
> When I try to boot the troublesome Sawtooth G4/400, it gives the impression
> of booting, in that the front LED comes on, the fan comes on, there appears
> to be a "click" at boot (no sound though, as if Mute were on) and looking
> through one of the rear PCI ports, I think there's a red LED interior light
> that must be from somewhere on the logic board.
> 
> No startup "bong" and no video (connected to a working monitor with good
> cables). Can't tell if the hard drive spins up, but I think so.
> 
> Attempted solutions:
> - I swapped in a working video card
> - I swapped in good working RAM
> - I swapped in a (different) good working processor
> - checked that all cables were connected solidly to the logic board
> (speaker, etc.).
> 
> Same results. No "bong", no video.
> 
> At this point, anyone betting on the logic board?
> 
> Any help much appreciated. Please email directly if you get a flash on
> inspiration that might help.
> 
> Chris