When I got my G5 it have four sticks of 512 MBs installed in it for a total of 2GBs and I just finished putting two 1gb sticks and two 512s in the remaining slots. Problem is the Power Mac still only recognizes the original 2GBs and none of the sticks I added show up in System Profiler and are listed as still being empty. Any Idea what is going on? I did confirm all the sticks are PC 3200 if that matters.