try reseating it several times i thought i fried 1 of my sticks when experimenting between 2 and 3Gb i had 2 X 1Gb in i put 1 Gb and a 2GB worked fine then swapped back to 2 X 1 Gb and it hung tried each stick in each slot and found that it was seated just out, even though i pressed it really hard and couldnt see n e metal pins,
n e ways if u do get it working i think you will see a medium to large performance increase my mate had a 3200+ with 256 Mb RAM and upgraded to 2Gb RAM and he said its like its been bought new again,
obviously he hasnt been on a C2D recently lol but it does help alot