Laptop restarts after every 3 seconds without any display

I have a vaio and I was cleaning the cooling fan in my laptop, but when I closed the laptop and switched it on, it would keep restarting itself, in a 3 second cycle with no display. The cooling fan moves, I have tried putting Ram sequentially, and even without the hard disk disconnected, same thing happens. Can anyone please guide me what the problem is and how to resolve it?
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More about laptop restarts seconds display
  1. During the cleaning the fan connector may have loosened. As a result during the Boot sequence fan presence is not detected.

    Check fan connector.
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