MDD CPUs going bad or seating issue?

Hi everyone:
Here's my situation. I got a used MDD dual 1.0 GHz that wouldn't properly start up. When the power button was pressed, the button would light up but go out when released. The fans would kick in, I could hear discs spinning, and the red LED on the logic board was lit. So I figured it was the processor card.
I got another dual 1.0 GHz processor card and installed it with the same result-fans, discs, red LED, but no chime or start up. Rather than dumping more money into some individual parts, I got another MDD (dual 867) that was fully functional. I took the 867 cpu and put it in the machine with the 1.0 and it did the same thing-no start up.
Here's the frustrating part. I put the 867 back in the machine it came from and it won't work in that one now either. The front button lights up then goes out and the fans come on super loud after 10-15 seconds. The red LED is still lit, but I'm not getting any chime or activity. I tried tried resetting PRAM and reseating the cpu card with no luck. Could the other machine (dual 1.0) have burned up the card that quickly? It was only in there for a couple minutes at most. As soon as I saw it wouldn't boot, I removed it and but it back in the original computer. Is there something on the dual 1.0 that could be screwing up the cpu cards? Thanks in advance.

Hi-
So, first off, I'd say that you're a glutton for punishment......
If it makes you feel any better, I have a room strewn with half a dozen machines in various states of disrepair, contrary to efforts otherwise. Not to mention all the spare parts.....jeez!
One note, the 2x 867 MDD is a 133mhz bus, whereas the 2x 1.0 MDD (and onward) are 167mhz bus. This will make a difference in CPU performance upon a swap. There may be some potentially useful information for you here and here.
To the issue- I would carefully reseat the daughtercard back in its original machine, and check all connections. Following this, I would reset the PMU and see what comes of it.
You didn't, by chance, scrape some tracings during your work?

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