I of course did it wrong! Then figured it out and did it right after the children started crying their 3 macs weren't working! When you put the memory in it really is important to push the memory chips all the way in with your fingers until they are well seated. If not... flashing start light computer won't even start, and at best only half of ram will actually work. So put them in right side up, slide them in carefully into their slots and slide them all the way in until they click into place. All happy now on Club Penguin and Kizi!