I've given up on the Apple forums, I hope MacRumors can help. Before I ask my question, yes: I have already reset Permissions. (not sure why ) And many other useless attempts to solve my problem, I need a real fix. Also, it is not a user-specific problem, it is in the OS. Situation: Macbook CD. When on AC power, I get many, many beachballs. No PPC software running. Any Intel app running, including simply: Finder. Used to have this problem on battery until I turned off "Put the Hard Disks to sleep when possible". Turned it off for AC, too, no change. This is supposed to be the solution, and it was....halfway. Think something is wrong with the Power or Energy Saver software that it doesn't work on AC. Question: How can I fix this? Maybe replace a specific kext, if I knew which one. Or a Terminal hack to make it work where Energy Saver fails?