2x1Gb on MS-6382

Hi,

I have a MS-6382 and the specs tell me i can use 2x1Gb on this board. its pc2100 ddr, i know it should work but it doesnt

both memory cards work, i can use 1x256Mb ( my old ones) combined with a 1Gb to get 1.25Gb, but both 1Gb memory cards will not work together.

they both work fine on their own or combined with my old memory but not together.

does anyone have any helpful info on this subject

thanks