How to fix the folder flashing with question mark on mac pro

I have a problem with my mac pro.  When I press the power on button, the grey of the screen become a folder flashing with question mark appears and it does not start.  What should I do?  I don't have an os x on a cd so I can not ignore the system...

See:

If a flashing question mark appears when you start your Mac - Apple Support

What model Mac? What OSX version was on the Mac?

If you do not have a partition recovery or restoration of the Internet

On OS X Recovery - Apple Support

Then you install an installation DVD

Tags: Mac

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