Well when I'm sitting on my iMac surfing the web, and chatting with people. All of sudden this black screen will scroll over everything. It'll say "Hold the power button to restart" or something along those lines. It's also in 4 languages. Also when I restart my computer sometimes it'll just go to a white screen, and beep three times. The light will flash three times also. I did a search, and I found it could be the RAM. But I would like to know if you guys have any ideas/input. Later. *Edit* I'm wondering is there way to defrag the harddrive? I have search throughout my iMac, and I haven't found anything.