Mac book pro won't boot

OMG please help! I am an expat in China and my Mac is my lifeline.
My daughter was watching an Itunes show and it froze (got the bouncing beach ball). I tried to force quit and it didn't work so I turned it off.
Now when I turn it on I get the grey screen with the apple and the bar at the bottom. It loads a little bit, goes back to the grey screen with the bar, and then goes to a black screen.
I tried resetting the SMC but to no avail.
Any advice would be greatly appreciated. I really can't afford a trip to Beijing right now. Thank you!

Hi c, and welcome to Apple Discussions.
Try running Repair Disk: Boot from install disc (insert disc>restart>immediately hold down c key and keep holding it until you see “Preparing Installation”)>at first screen select the language and click Continue> click on the Utilities Menu in the menu bar>open Disk Utility>select your HD in the panel on the left side>click Repair Disk at bottom of main window. Run this at least twice, and keep running it until it says “appears ok” twice in a row. If that doesn’t happen, you may need a stronger utility such as DiskWarrior or if the directory is damaged beyond repair, you may need to reinstall the OS, or you may have a damaged HD (repair utilities can only repair the directory structure, not the HD itself).

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