Stilgar, I had the very same problem with my Soyo motherboard. I had 1.5 GB of memory on my board and there is an apparently well-known problem with memory over 1 GB or 900 MB. Go to the General section and look for my thread titled "Kernel panic on Fresh Installation" for details.
If you don't feel like doing that, I suggest you remove memory cards until you are under 900 MB. It worked for me.
If you need the memory there is an erratta for 9.1 at Mandrakes website. The address is posted on my thread. Good Luck!