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I have a 3 year old Mac Pro, with an original HD and in SSD that I installed myself about 1 year ago. All software updates and Mt Lion are installed. It has worked flawlessly.

Recently the computer is crashing unceremoniously -- either it fails to wake up from sleep or it just stops working (sometimes with a weird sound). This happens 1-2 per week of hard use. Definitely unusual.

How do I troubleshoot this? I seem to be unable to locate an apple hardware diagnosis that works. I installed Mt Lion from the app store, and my older DVD as well as a new memory stick from a Mac Air refuse to run (because it's "incompatible with this configuration")

Here is my system log from last night, and the failure to awaken this morning after the crash. http://pastebin.com/N0Zw7FTZ

Any insights would be awesome!

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You can use Disk Utility to do a filesystem check on each of the harddisks. Open Disk Utility, select the harddisk and in tab 'First Aid' press button 'Verify Disk'. If your Mac Pro crashes during the consistency check the harddisk that was being verified is probably dying and I would recommend replacing it. If you are CLI-inclined open a Terminal and use fsck_hfs -n /dev/XXX to get similar results (Disk Utility uses fsck_hfs). – jaume Oct 26 '12 at 12:45

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