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My Macbook Pro 2007 does not turn on?

Hi, My Macbook Pro 2007 with Snow Leopard OS makes that "GONG" sound and I can hear the laptop is running when the power on button is pressed to power up the laptop. However, the monitor screen stays black. Any idea how I can trouble shoot this problem? Any advice is greatly appreciated.

 
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Grant1842
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Sounds like a inverter or back light problem.

While it is running can you shine a light and see a faint image ?

Does this laptop have a place to hook up an external monitor ?
If so hook up to external monitor and see if you have video.
If you do have video with an external monitor the we know you video chip(card) is ok and it will be a screen issue.
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Grant1842
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