Poll: Only one DDR DIMM recognized on ASUS A7M

[pxw03]

I used Crucial PC 2100 DDR RAM on Asus A7M motherbord. I installed 2 256 MB DIMM and only one 256 MB appeard on BIOS not 512 MB. I swapped the memory to make sure both memory were fine.

I wondered if someone has similar problem? Is there any issue with this board, or simply it is compatibility issue betwwn crucial and Asus?

Any comments will be appreciated!