lenovo y510p start up problem.. help please !

My lenovo y510p is just 2 months old.
When I switch on my lenovo y510p , lenovo logo appears for a very less time ( less dan a sec) followed by a black screen for about 10 seconds .
Then a screen showing " please wait " appears followed again by black screen.
Now after few seconds when I press ESC button login screen appears for some micro seconds then again a black screen. Cant login . Cannot do anything.
Please help.
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