I jsut bot 2 1GB chips to upgrade my 20" Intel Core Duo iMac. For some reason, when I go to About thie Mac, it is only showing 1 have 1GB of memory. I have tested both chips, and they are good. If I click on "memory" in the computer properties window, it says DIMM1/Bank1 1GB, but does not even list DIMM2/Bank2. Did I screw something up? Have a hardware problem? Thanks!!