Lenovo G500 won't turn on [Closed]

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Hello, I desperately need help. My Lenovo G500 laptop wont turn on. When I press the power button, a fan will run for at least two seconds, then stops. I read a lot about how others diagnosed similar problems but it does not seem to help at all. When I change a memory ram to the alternative slot, the laptop will turn on and off repeatedly without displaying on the screen. Looking forward helpful advice/solutions. thanks in advance