Yes I know the Dell PowerEdge is a Server but I couldn't find the Server section so I thought I'd put it in "Desktops" as it's a PC at heart.
n.b. Dell produced at least two types of machine with the name 1400SC (different motherboards).
With one it doesn't matter what memory you put in it limits itself to 256Mb. We've tried 2 x 256Mb combos, 1 x 512Mb sticks. We know the memory works as we've tried it in an earlier 1400SC.
In X years of dealing with servers I have never seen this trick. Has anyone seen this problem before and discovered the work around.
With many thanks,
ps. X is getting a frighteningly large number :-)