I got my base 21 on friday. I originally installed bootcamp but then found i liked parallels better. So i still have bootcamp but run parallels to get into windows. I have two users set up, my wife and i. Besides that i only installed office, skype ang log me in. Oh and i have time machine backed up to a time capsule. I leave parallels windows suspended when not in use. So now the potential issue. 4 times since friday i've had the spinning beachball get stuck. All 4 times i had to hard power off the iMac. I let it spin about 10 minutes each time. 3 times i was just doing mundane tasks like switching programs or messing with settings. One other time i was bring up parallels. Is this cause for concern? 4 times in 1 week? My 2009 macbook pro has hung this bad once in over 3 years.