MacBook Pro stalls with image of Hard drive on screen

I'm running Snow Leo 10.6.8.
I just ran a software update and reboot, and my Book Pro got stuck with the white screen with a large Hard Drive Icon and an upwards arrow under it.
I have never experienced this icon appearing on bootup before. 
Big problem?

What did you figure out? I am having the same problem!
Have a 200GB HD
My System Profiler states:
Capacity=185.99GB which I understand BUT-
It also states Available=26.25GB
Then, when I go to the Activity Monitor it states:
Space Utilized=99.14GB
Space Free=25.85GB
With a total of 124.99GB
WHERE IS THE MISSING 51GB of memory?!?!?!?!?!?!?!?!?!?
What is the deal????
Anyone?

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