Model A1224 / Mid 2007 and Early 2008 / 2, 2.4, or 2.66 GHz Core 2 Duo processor

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Won't Turn On Power UP

I can see the Diagnostic Leds, and

Number 1 : It's On when connect the AC Cable

When I push the start button the Leds 2 and 3 turn ON

No 2: ON

No 3: ON

But the LED 4 do not. Still OFF. And the Fans not working, some advice about it?

The SMC was reset and nothing happens.

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How to determine what is defect if the system doesn't post? from Mayer

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good advice in that post +

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+ excellent source

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LED #4

Indicates that the computer and the LCD display panel are communicating. This LED will be ON when the computer is turned on and video signal is being generated. If the LED is ON and there is no image on the LCD display panel, the LCD display panel or inverter might be installed incorrectly or need replacement.

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