It means that system cant find any HDD to boot the system from cause you didn't install any. When you started installation process you had an option to 'customize' your OS X installation, pick the chipset drivers, audio, kernel or select anything you might need of what installation creator(s) included. Just so you may know for the next time when you start fresh install for example.

To fix this, boot from the installation DVD and when Installer starts, launch terminal. You have to copy nforce kexts for your board into installation (the Mac OS partition you created). Try to search on this forum and also google is your best friend how to do this, repair permissions and when you restart next time you'll go directly into mac os. If you can't find how to do this i will write a short 'how to' for ya. Cheers!

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