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Hi, 

 

I've been reading passively this forum for years. But now, I really need to exchange knowledge regarding one of my problem. 

I have a PM8500 (WS8550 to be exact), I forgot to remove the battery and that ends with a little corrosion on the motherboard. No startup sound, no video, disks are spinning, but nothing. I clean the motherboard as much as I can with no result. I ended up buying a new motherboard (cheap), switching everything necessary with no more result. It leave me the PSU or the processor card. What can be the problem ? Can I use processor card from 8600 or 9600 or even 8100/8200 ? Which processor cards are compatible with ? I have a lot of old powermac on storage that can help the diagnostic. 

Any idea ?

Thanks, 

 

plb

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  • 2 months later...

There are some obvious things that come to mind.
Like the way the Memory SIMMS is arranged. When I had the memory SIMMS in the wrong order, then exactly what you described would happen.
Download the service manual for your Computer and arrange the memory the way it is described there. Actually start with the minimal items back on the Board and see if it comes back on.
Also buy a fiberglass pencil and clean the contacts with it.
Are the VRAM SIMMS in the right order?

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On 5/11/2019 at 1:08 PM, plb007 said:

Can I use processor card from 8600 or 9600 or even 8100/8200 ? Which processor cards are compatible with ? I have a lot of old powermac on storage that can help the diagnostic. 

 The 7300, 7500, 7600, 8500, 8600, 9500 and 9600 all used the same processor slot with different processors on daughter cards. I’m not sure if they can all be swapped around, but they all had G3 upgrades for them, or G3 zif carriers, which you would be able to drop in a G3 zif you had, or bought. 

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The later 8600/9600 CPU with cache on board instead of the separate cache stick are probably not swappable with older boards.

 

8100 series CPUs are soldered on I think.

 

Make sure to hit the CUDA switch when swapping CPUs and make sure they are fully seated or the machine acts like it is 100% dead.

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