My laptop seemed to be frozen and I could not shut down from the menu. I held the power button for a long time and finally it shut off. When I started it again it turned on to show a black screen with an icon of a file folder with a question mark inside

Any idea what a blank screen with a flashing folder with a question mark inside of it means???

Ambinder55,
it means that the forced shutdown corrupted some portion of the internal disk’s filesystem. Which version of OS X is installed on your MacBook Pro?

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