How to fix a problem with my book pro that has a gray screen with a folder with a question mark on it

does any one know how to fix a problem with my book pro that has a gray screen with a folder with a question mark on it?

Hello Mokhtary123 and welcome to Apple Support Communities,
It will help us diagnose your problem to know the exact model, size, year built, RAM installed and OS you're running.
But basically your system can't find the boot disk. Usually this is a symptom of a dead/dying/corrupted hard drive;
A flashing question mark or globe appears when you start your Mac - Apple Support
OS X Recovery
http://support.apple.com/en-us/HT4718

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