I have a 2.4 gig intel core 2 duo imac running S.L., with all the software updated. Quite often, mail and itunes just freeze up and I get the spinning rainbow colored wheel. It happened before my clean install of S.L. also. Ive deleted pretty much all of non-essential files and programs, but still cant resolve this. Could this be a hardware based issue, or could it still be something I am running on here ?