Mountain Lion Update Doesn't Finish - Laptop will not boot

Hi,
Last night I saw that there was a Mountain Lion update available for my MacBook Pro. I've always updated my software as the updates became available. I had several other apps to update, so I chose "Update All".
I got a message at the end that the installation required a reboot, however, the MacBook Pro could not restart as it said that FireFox was canceling the restart. I looked and the FireFox add-in XMarks was stuck in some type of failed sync mode, and couldn't be stopped. I was also unable to force FireFox to quit.
After an hour of this, I finally just had to press the off button and power down. I assumed that the software update would still continue when I restarted my computer, but all that I have is just a grey screen with the Apple logo and a circular progress indicator that has been going in a circle for about 7 hours.
I guess my first question would be, "How do I actually boot into my MacBook Pro and get past this grey screen".
Is my laptop hosed? If so, how would I go about reinstalling Mountain Lion? I bought my MacBook Pro on June 21, 2012, so everything should be compatible. I have previously updated to Mountain Lion without any problems.
I'd like to find some way to be able to boot up my MacBook and skip this grey screen. But, if I'm just in disaster recovery mode, how would I obtain a Mountain Lion install DVD? I've already paid for the update.
Thanks,
William

I found out how to get to the disk utilities. I also did a verbose log of the boot-up process, and it hung right after it said that the handshake with my internet connection was complete.
So, for others, Command-R at the boot tone got me to the Disk Utilities, and Command-V at the boot tone gave me verbose logging of the bootup process.
I repaired my disk and permissions, and nothing changed, so I decided to reinstall Mountain Lion.
Thanks,
William

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Mountain Lion Update Doesn't Finish - Laptop will not boot

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