For the 3rd or 4th time in the past month, to my immense frustration, my 3 month-old Mac Pro has completely locked up requiring that it be shut down manually (i.e. holding down the power switch).

I recently rebuilt my 2009 MacBook Pro; installed a 1TB drive and 8GB RAM to give it some more life. I also enabled disk encryption. Most of the time, it sleeps, so I rarely have to boot it from an ...