K8T Neo creates 'phantom' RAM and won't recognise the real stuff...

I have just replaced my computer's motherboard and CPU, from an ancient ASUS A7V266-E motherboard and an AMD XP CPU (1.1GHz) to a new K8T Neo-FIS2R motherboard with an AMD Sempron 2.0GHz processor, both brand new. I thought that it would be possible to use all the other components until I can save up enough for a new graphics card, RAM etc.
All of the other components seem to work fine. After making all the connections and starting up for the first time, Windows (XP) loads successfully... but VERY, VERY slowly.
About an hour after loading, I finally manage to right-click on 'My computer' to be told that I apparently have "AMD Unknown Processor - 2.0 GHz" and "64MB of RAM".
This is what surprises me, because in the DIMM ports at the time were three 256MB PC2100 DDR sticks, all three identical - two which were in the motherboard I had before (sequential serial numbers and everything), and another one from another PC purchased at around about the same time.  All three worked fine in their old computers. So not only is the PC not recognising that it's actually got 762Mb of RAM stuck in it, but it's creating 64Mb out of nowhere!
AFAIK, the sticks should be compatible, because the RAM specifications appear to be the same for both the Old ASUS motherboard and the New K8T Neo - check out the specifications on the left-hand-side for each board.  However, clearly something is not right - it could be a compatibility issue, or is there something I'm missing?
All it says on the sticks of RAM is "256MB PC2100 DDR MEM" (plus "Made in Korea", of course  ), but crucial.com seems to be telling me that the RAM must be SDRAM, because that's all that would work in my old motherboard.  Is there some other configuration issue I've overlooked?
I've tried swapping the sticks around and taking some of them out - no change, either in the display or in overall performance.  I tried loading it with no RAM at all - didn't like that one bit!  I had a look through the BIOS (with the instruction manual close to hand), but nothing jumped out at me - and I really don't know what I'm looking for!
Really confused!    Any ideas what's going on? Any help would be much appreciated.

Quote
Check with memtest86
...yeah...
...look on the bright side...when I tried PC2100 RAM with a Socket 754 CPU it wouldn't even POST... 
...you might have to enter BIOS and configure the RAM manually rather than Auto...just a guess...

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