Hi all. I have a little issue with the ram in my Power Mac G5. My Power Mac is a G5 dual 2.0 ghz Power PC, PCI version. http://www.ebay.com/itm/2GB-KIT-2X1GB-PC3200-DDR-400Mhz-FOR-DELL-DIMENSION-3000-RAM-MEMORY-LIFETIME-WARR-/151615696297? It came with 1.5 gigs of ram: two 512 sticks and two 256. Right now, it shows only the two 512 sticks working; the other two slots say "empty". I'm not sure why. I bought some ram and tried it. I think it was the wrong kind: http://www.ebay.com/itm/151583031871?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT I'm going to return it and order some more ram, and make sure it is a kind that works for Mac. I believe it should take a total of 4 gigs. I'm just going to try two new sticks, 1GB each. That will give me quite a lot. Any thoughts on why it's not seeing the 256 slots? One thing I should note: when I installed the ram that doesn't work, the Mac did not like it. Red light came on, and it wouldn't even start up. I had quite a time getting things configured in a way that would even let me start up again, with the original ram. I understand they need to be 1, 1, 2, 2 as matched pairs. Even knowing that, it seemed fussy. If two slots are bad or something, I should still be able to install two new 1GB sticks in the current good slots, right? Thanks so much for all the help at this forum. You guys are great.