Hi everybody! My Mac-Mini (purchased new in Dec, 2013), with Mavericks was working fine until five days ago. For internet I have Uverse from AT&T. Before I go on it might be good to explain that typing this thread is taking time, because, although I'm not a typist and use one finger from each hand, I can still type faster that the characters appear on the screen. A typo means delete, I hit delete and watch the rainbow ball for several seconds, then the character is finally deleted. Typing this thread is an act of patience for me. I had quicker results typing posts years ago with dial-up. A week ago I could listen to streaming radio stations and type and send emails. No longer the case. Now the streams stop. Here are some symptoms: I try to find if I have any unwanted apps on the hard drive. I double click the Mac HD icon, I get the rainbow ball and it turns and turns, until finally it opens. All apps are okay. In any internet window, scrolling up or down I get the rainbow ball and slow scrolling. I check to see if I have any damaging cookies, local storage, or plug-ins in Safari Preferences. Can't scroll in there either without the rainbow ball and scrolling is very slow, worst than dial-up. If I want to Sleep, Restart, or Shut Down I go in the Apple menu and get the rainbow ball. It turns and turns and turns, I get tired of watching the ball turn, and shut down by pressing the button on the back. I suspect the problem is malware, but can't find anything. I need help! Where can I find the culprit? Typing this thread took me about 20 minutes, and a lot of rainbow balls. I appreciate all comments and suggestions.