hi folks, im trying to upgrade the ram on my sons dell lattitude from 256 to 512, it just wont ad on to the second slot, ive tried using a 512 chip out of my ibm t23 on its own but the dell only seems to work with the chip that was in it allready, in either slot, it dosent recognise any other chip what ever sise or make, any ideas folkes, (confused of n wales.) ps its running xp sp2.