i've seen some motherboards not working with G3s while others would do with the same components (i mean swaped ones). And these boards have been perfectly working for years with the original cpu.. they just wouldn't with a G3 card.

it's possible that yours is one of them.

You might try working with only the original CPU for some time, with full config, after full nvram reset, and then reswap cpu w/cuda reset to G3. Then you will know.

In any case you shouldn t use the 2x16Mb dimms that could be 70ns and are anyway useless if not too old and risky.

In fact 4x64Mb is enough and perfect for OS9 and thus you'll have 2 spare modules.