OK, I decided I didn't want to run 9.2 RC3, as I'm a noob at this and don't want to deal with any potential problems (yet). I decided to try and install 9.1, once again reusing the existing partitions and mbr originally created when I installed 8.4. It worked.
So it seems like the the problem is in the mbr/boot sector/partition table which the 9.1 installer creates (and that my system BIOS doesn't like it).
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