Macbook stuck on gray screen, apple logo, and loading symbol?

I just purchased my Mac a couple of days ago. Working fine for awhile, but now it "chimes", goes to a gray screen with the apple logo and the loading sign. It is stuck there and I am not sure how to proceed. Thanks for any help.

Disk Utility can repair the disk this way:
-Search your installation DVD's.
-Insert the disc 1 and sthut down your Mac
-Start your Mac again while holding down the C key
-Now your Mac should boot from the CD, this can take some time.
-After a while you will see a installation screen where you can chose a language.
-Chose English and continue.
-Then click some time's next and agree with the "Software Agreement".
-Open Disk Utility. Top menu bar --> Utilities --> Open Disk Utility.
-Select your hard disk in the list of disks and volumes on the left side
-Go to the First Aid (tab somewhere on the right).
-Click the button to verify the permissions.
-Then Click the button to repair the permissions.
-Click the button to verify the disk.
-Then Click the button to repair the disk.
-Exit the Disk Utility and the installer.
-Restart your Mac

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Press and hold the power button down to force a hardware shutdown (emergency use only!)
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Drag and drop copy your users file folders (music, pictures, documents etc) to a regular external powered drive as soon as possible.
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Unmount and Disconnect all external drives once the backup process is completed.
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Your problem is likely due to a incompatible third part at boot kernel extension file that some program installed into OS X at some time.
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Macbook stuck on gray screen, apple logo, and loading symbol?

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