Not to get too much into the technical details, but some CPU upgrades (like Sonnet) use certain available (bus-multiplier) settings in ways that can lead to improper reporting of the CPU clock speed.
It's probably not being reported properly, and that's probably why the 9.2.1 installer is throwing a fit. I'm not sure Sonnet produced a 600 MHz dual (seems kind of waste on a DA if true), but that clock setting of 600Mhz doesn't seem right. You say hardware test CD shows dual 600MHz. I think the problem is with the Sonnet as eww suggested. I'm pretty sure I got it to work with my old Giga Designs dual 1.33GHz CPU upgrade. The retail 9.2.1 CD will work on DA - I know that for a fact. Stock DA, as long as your 9.2.1 installer disc was not shipped with, and specific to, another Mac model. The DA was shipped with an OS 9.1 installer disc, so OS 9.2.1 would be fine if you had a If a retail OS 9.2.1 installer CD is what you have, and it won't start the G4 DA, it can only be because of the Sonnet processor. On OS 9.2.2 installer CD would do you no good, because all 9.2.2 installer discs are specific to particular Mac models, and none of them to yours. I think you'd better call Sonnet and ask for advice. But since you don't have your Mac's original processor, this isn't an option for you. Once OS 9 was installed, the processor upgrade would run it without a hitch. The installer would find the proper hardware in place, and the installation would proceed normally. If you had upgraded your processor yourself, the standard recommendation would be to reinstall the original processor card, perform the OS 9 installation, and then replace the original card with the upgraded processor. Because your processor has been upgraded, the hardware configuration isn't what the model identifier says it should be, and that's probably stopping the installer in its tracks. Your installer disc expects to find a certain hardware configuration after reading the model-identification information encoded in your Mac's hardware.
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