Mac Pro shut down on its own, then on boot up it beeped steadily for 2 min?

I put my 2009 Mac Pro to sleep then the next day I find it completely shut down! I boot it up and then I hear a steady beep (every second) for about 2 minutes. After 2 minutes the beeping went away.
Any idea what caused Mac Pro to shut down on its own? And what does the steady beeping mean? The beeping is coming from inside the Mac Pro's speakers, not from my BOSE 5 computer speakers.
I don't think there was a power outage as the UPS is fully charged, and I asked a neighbor across the street.

I wasn't clear in my description, it's a steady continuous beep, it's a rhythmic beep -- it'll do this for 200 beeps or about 2-4 minutes.

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MacBook Pro shut down on its own resulting in 0% of CPU being idle

Dear Friends at Apple,
I'm concerned that the sudden & complete shut down and the fact that the notebook is running VERY HOT (temperature wise) is putting my 2010 MacBook Pro in danger of total ruin. Is this an indication that the hard drive or CPU is about to burn up?
Please help!!! I'm SO VERY CONCERNED! I depend on my notebook so much!!!
Blessings and thanks,
cmpi5555

You may be right in your assessment regarding your Mac shutting down because it reaches the thermal shutdown temperature. The only thing that's a bit unusual is that it shouldn't reach that point after simply watching 16 minutes of YouTube videos.
Download the 14-day trial version of iStat Menus 4 and monitor your temps and your fan speeds. See if the temps increase and the fans are above 6000rpms when watching videos.
Call back,
Clinton

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These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
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https://discussions.apple.com/message/17337738#17337738
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http://docs.info.apple.com/article.html?artnum=14449
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Mac Pro shut down on its own, then on boot up it beeped steadily for 2 min?

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