Beach ball appears, freezes everything, Finder unresponsive.
THe beach ball has recently started to appear during normal activities follwed by a total freeze of everything. Problem started after down loading 'Drop Box'. When I can get to 'force quit', nothing responds. I'm forced to shut down with the power button. Never had this problem before.
The local certified techs " rebuilt the OS", then installed maximum RAM and finally installed a new HD, saying probable cause was old HD( after "cloning" the data). Threw out Drop Box, unplugged USB mic interface, even unplugged power.Problem persists during normal use. Please help! Thanks!
MacBook Pro, Mac OS X (10.6.8), 17"