Block Logo after entering password in MacBook Pro

Hi,
I have MacBook Pro 13 inch, specification is -
i5 Processor
4 GB RAM
750 GB HD
Installed OS- Yosemite 10.10.2
Problem: I am facing a problem after startup login after entering correct Password, then is showing Block Logo on white background.
I am facing this block logo screen every time when i clean reinstall the OS.
Steps i have done:
1. i clean reinstall os 2-3 times
2. Reset the NVRAM
3. Start the os in safe mode
Please suggest me the solution.
Thanks in Advance

same condition occurred.
block logo

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