Display turns off and MacPro when is running, Why?

My MacPro 2.66 GHz 2 GB Tower shuts its monitor off after it is being used for a while.  I can tell the computer is still working and the computer thinks the monitor display is still working.  It just has a black screen.
What do I need to do to fix this?
Is it a monitor problem or a computer problem?

My MacPro 2.66 GHz 2 GB Tower shuts its monitor off after it is being used for a while.  I can tell the computer is still working and the computer thinks the monitor display is still working.  It just has a black screen.
What do I need to do to fix this?
Is it a monitor problem or a computer problem?
How can you tell the computer thinks the monitor is there if it's black?  Are you using two monitors?  If so, switch the video connections to your video card and see if the problem continues on the same monitor or the same video card port.  That would tell you if it's the monitor itself or the video card.

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