CI********C13 is the serial no. Mac book pro. Blinking folder unable to connect the hard drive why?

CI********C13 is the serial no. Mac book pro. Blinking folder unable to connect the hard drive why?
<Personal Information Edited by Host>

That means that a valid startup disk can't be found.
A flashing question mark or globe appears when you start your Mac - Apple Support
Your startup disk could be corrupted, the disk failed, or poor connections
Reset the SMC and NVRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
About NVRAM and PRAM
Try booting to Recovery and repairing the HD
OS X: About OS X Recovery - Apple Support
Next reinstall the OS if Disk Utility in Recovery can see the HD
OS X Yosemite: Reinstall OS X
If the HD can be found check the connection. Next replae tthe HD
Last:
Make an appointment at the Genius Bar of an Apple store.
  Apple Retail Store - Genius Bar

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