My macbook restart everytime. it does not pass starting sound and white screen

I my using macbookpro 13, i7 processes 2.9 GHz , 8 GB ram, 750 HDD
Serial no: C1ML2H0YDTY4
OS : 10.9.5
Now it restart or not, I don't no. but Starting sound continuously give and white screen.
What to do?
What is the Problem?
It Hardware or Software Issue
Please Help me out

First try SMC and PRAM resets:
http://support.apple.com/en-us/HT201295
http://web.archive.org/web/20140711222006/http://support.apple.com/kb/ht1379
Then try a Safe boot:
http://support.apple.com/en-us/HT201262
Any change?
Ciao.

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