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Mac Pro will not wake up from sleep mode

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Hi,
In my Energy Saver I have my system set to go to sleep after 15 minutes of not being used.  Unfortuantely, when I try to wake the system up from sleep mode, it freezes on the screen saver and I have to hard restart the computer to get it to turn on again.  I see that this is an issue with MacBook Pros, but I'm not seeing much in the Mac Pro Towers.  I did see a thread about Parallels VM causing causing OSX to not wake up from hibernation mode, but I am not always running my VM Ware when the system decides to not wake up.  Any help/advice is appreciated.
Thank you,
Julia
OS X Version 10.6.7
2x 2.93 GHz 6-Core Intel Xeon

Answers

.... and you fail to mention the model SSD and firmware version... or how you installed or cloned the system
most people also move most of their user folder to another hard drive.
sounds like a more normal Mail + OS issue if just that.
hard restarts = directory corruption so don't reboot w/o first either Recovery Mode, then follow up with Safe Boot.
And maybe you have 3rd party hardware or software that is not compatible with 10.8.2 needs to be considered as well.
2008 model 3,1 also are having a lot of issues this year. Including another critical piece, what gpu it has.

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