I need some help. My 1 month old mac is giving me more problems than any of my other macs combined. I have had two instances where the status light on the front flashes 3 times when I turn it on. I hear no start up tone, I don't think it even makes it that far. According to the manual, 3 flashes means incompatible ram. The ram I have is 2x128 factroy installed and 2x256 after market, purchased at the apple store the day I bought the computer (they had a nice deal going). First time it happened, I took it back to the store. They of course did not find anything wrong with it. They reset the pmu and pulled the ram and reseated it. This happeded to me again earlier in the week and I again reset the pmu along with the pram. Its working fine now. My wife uses the computer while I am at work to spend all of my hard earned dollars on eBay, she tells me that today, the fans kicked into high gear, and she got a prompt telling her that she needed to shut the computer down by holding the power button in for 5 seconds. I have rebuilt the permissions once and I am planning on doing it again as soon as I am finished here. Does anyone have any thoughts or suggestions or should I just take this thing back to the store and let them work it over? I have been around macs all my life, so i have a good feel for some of the semi advanced do it/try it yourself stuff. Thanks for the help in advance. I am new to this sight and I think I have learned more from reading these threads over the last couple of weeks than I have in the past year!!!!