Need Help--G450 Shuts down after few miutes

I have a G450 laptop, purchased in the month of June. I am using Win 7. From yesterdays onwrads when ever i am switching it on it gets shut down with in few minutes. After taht if I am restarting it never restarted. I left it for 30 Minutes and then try to switch it on. It again restarted but with in few minutes ir shut down. The laptop is not getting heated up, so I do not think its a problem of Heat Sink and Fan Issue. Please help....

press f8 to load safe mode and check if issue persists.
or try to perform clean windows installation.

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