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The symbol you're seeing indicates that your computer is unable to load OS X (your MacBook's operating system). This can be due to either software corruption or a failed/failing hard disk drive.
You mentioned having already run Disk Utility; was your hard drive found? Did Disk Utility report back with any errors? Please let me know and we'll see what else can be done to get your computer running again.
That's very good news that the problem does not appear to be hardware-related! You should, then, be able to bring your computer operational by reinstalling OS X.
Please note: this process will essentially erase your current OS X installation and all files inside it; it will be like starting with a new computer.
To proceed, please follow these steps:
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