I have serious problems with my iMac (21.5-inch, Mid 2010, 8GB Ram). I work mostly with the Adobe Creative Suite CS5, Windows XP @ VMWare Fusion, iWorks, etc, and now for the third time in a timespan of 4 months, the iMac freezes and makes an extremely loud (nonstop) noise. This time I managed it to record a video.: http://www.youtube.com/watch?v=EDJmZXDtZMw I've already sent the iMac to a Service Provider some weeks ago and they changed the HDD, but it seems that this was not the problem.. Anyone ever heared such a loud noise coming from an iMac?