So I recently purchased a 1Ghz 12" iBook on ebay. It functions fine for about 15-20 minutes then freezes, pretty much only after it is moved. I have read the replies to some articles and you guys seem to have a pretty good understanding of the screws in the logic board or cracks in the frame causing flexing on the logic board. I was wondering if there could aslo be defective RAM in my computer? One friend suggested that. Does this make sense to anyone? I seemingly have no video problems whatsoever. If anyone can help I woulf be most grateful.