>>More than that. According to the Mac Catalog, 7.1.x was required on the
>>following:
>>
>>Duo 2xx
>>IIvi/IIvx
>>LC III,475,5xx,630 [580 requires 7.5]
>>Centris/Quadra 6xx, 8xx
>
>Since we are on the subject of what machines _require_ System 7.1 as the
>bare minimum...anyone have a clue as to why my lovely Quadra 610 (Full
>040) will not accept an install of 7.1 off of the 7.1 install CD that
>came with it?  I get a message that says that I need a newer OS to boot
>the machine.....
>

This used to happen with my IIvx as well (until I fixed it). Try zapping
your PRAM (command-option-p-r). I think that should work.

good luck,

  - a