Mac Mini Keeps freezing and have to manually power down and restart I have a mac mini 2.3Ghz Intel Core i5 running 2GB 1333 MHz DDR3.  The mac keeps freezing.  Sometimes while I'm working on it, but often just when I leave it and it won't wake up and I have to hold down the power button to turn it off and then turn on again.  Any ideas on how to sort this?  Should I just upgrade the RAM or is it likely to be a different problem?  When it freezes nothing I try including force quit seems to work.  Thanks in advance, David
I had a similar problem with my Mac mini. I tried different RAM, re-installed the OS, looked at system logs to try to figure out what was causing the problem. I got nowhere. Eventually I took it into the Apple Store to have a genius take a look, and at first it checked out fine. They kept it overnight and determined the logic board was bad. After a warranty replacement, it's working fine.