Thanks to all who sent suggestions; they didn't work for me (isn't it funny how these old machines all seem to have their own personalities?), but they're much appreciated.

When I dug out the instructions for the Sonnet CPU, I found that they actually do warn you not to reset PRAM from a cold start, as it will reset open firmware needed for the new CPU to be recognized. They even include a floppy that you're supposed to be able to boot from if you do mess things up, but I wasn't able to start-up from it. So I finally went back to the beginning: put the original CPU back in, reinstalled the Sonnet software, and then reinstalled the Sonnet CPU. A lot of bother, but it worked.

So: be VERY cautious with resetting PRAM, and keep that old CPU card around!

Thanks again,
Eric


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