Dell Xps Lights Off

I hear a noise, high frequency feint to turn on my laptop?

It is a Dell XPS Gen 2 laptop. I just had the motherboard replaced and I have a New AC adapter for I delete these aspects. When you press the Power On, Power LED Light comes, I heard a sound of high pitched feint and then turns off automatically after about 3 seconds. The screen does not turn over this period. He does this out of the battery, and when the AC adapter is connected to the computer as well. All thoughts of what might be?

Each The processor fan or hard drive, likely in that order.

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