I had the same problem with OS 8.0. Switching to 8.1 or higher solved the
problem for me. (I also keep my ethernet card in the bottom slot and my
modem card in the top--all the time.)
>> My 2400 has had a near identical problem for most of it's life... the bottom
>> slot is the one that does this. Cards inserted there either freeze the Mac or
>> prompt me to format it as an unrecognized memory card...
>
> I have the same problem; the bottom slot doesn't quite work right.
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