I have a cirlce with a line through it at startup.  What does this mean?

I have a circle with a line through it at boot up.  What does this mean?

It means that there is no bootable disk found.  This
could be either a totally corrupted disk or a hardware
failure.
If you were running OSX 10.7 or 10.8, you could try booting
into the Recovery HD by holding down Command+R at boot
or holding down the Option key and select the Recovery HD
to boot from.
If doing this also fails, then you likely have a hard disk failure
or perhaps some other hardware issue.

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