FWIW, I had this issue with 4 matched RAM sticks that worked fine in a Q700 but gave exactly these symptoms in a 950. Make sure the RAM is fast enough, and for preference test with RAM that's been shown to work in another Q950.
Thank you for the link!
I still feel that the stock dual sockets will offer more resilience against solder joint cracking and offer less strain on the socket legs over time than a single socket, especially if you swap RAM often. But it seems the dual socket kind are no where to be found.
Sorry for the lack of updates, the last puzzle piece (the 24 pin plug) is taking A WHILE to arrive. But I should have a functioning 950 by the end of the week!
Edit: Also, I just bought my first vintage LCD monitor, a Fujitsu-Siemens X17-2 from 2003. Should work with the 950's internal video quite well.
Yeah, I misunderstood it. I should have specified that the drive I was using is an NP model of Fujitsu U160 SCA drive, that does have the jumper for Narrow mode. Am I correct to assume that my SCA U320 drives that aren't recognized in the same setup, and don't have the narrow mode jumper setting, would work in a narrow bus Mac with the upper bits properly terminated? @max1zzz's thread on terminating the adapters does have an example on terminating the upper bits on one of these adapters, if I recall correctly, so I might need to try that and see if my 72GB drives would work on Macs then.