You didn't mention whether you'd read the forums at amdmb.com

One of the sticky threads there is "How to set up your Soyo Dragon", (paraphrased...). Amongst a lot of very good information that you definately should read is this gem...(again paraphrased)... "The Dragon is very picky about memory seating. Even if it appears as though the memory is seated correctly, it may not be. If you are having memory problems, then try reseating it."