Macbook Won't Start After Accidentally Interrupted Software Update

Hey all
I'm in need of HELP!! For the first time yesterday since my macbook purchase earlier this year, I tried installing the software updates.
After the computer downloaded the updates, it prompted me to restart the computer and so I did. As follows, the computer restarted and began to install the updates after restarting itself (the screen's background was blue displaying only the (bar) progress of the installation, which I accidentally interrupted and shut down).
Today, I've been trying to turn it on and even consulted the troubleshooting resolutions including restarting the computer with the control-command-power key combination, 'resetting the PRAM', and 'resetting the Power Manager'. I did this a couple of times just to be sure, let the screen load for awhile and still the screen won't go pass the gray apple logo with the loading circle.
What should I do now guys??

It is a very good idea to do a complete backup (clone) of your hard drive to an external drive before installing new software. That way, if it goes amiss for any reason, and they sometimes do, you can get right back to the exact state you were before the install or upgrade.
An external hard drive for making a routine (daily) backup of your computer's drive will be the best spent $100 or so you will ever spend on your computer. Even if your hardware gets corrupted or your drive burns out or your computer gets stolen; in all cases you do not lose your computer's data if you keep a current, duplicate external drive.

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Macbook Won't Start After Accidentally Interrupted Software Update

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