I have been trying to add 128Mb to the existing 128Mb in an Iridium Starbook 500 Laptop. The existing 128Mb module was in the right hand slot, I have tried putting the new on in the left slot and putting the exsting one in the left slot and the new one in the right hand slot. Whatever I do, the laptop only recognizes one of them. PST says 131Mb installed (the 128Mb module and the onboard 640kb). Is there a switch or jumper that needs to be set. BIOS just displays the memory it thinks is installed it doesn't appear to give an option to type in new values (unless I have missed something). Any help appreciated.