Fan makes noise and will not boot
I have removed the back, tested the power and have 2 lights on steady, but still no boot and it kicks into a loud fan noise.
Is the power supply supply shot?
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Your problem is between the logic board and the the video. Check the "cans" capacitors on your logic board for swelling and/or corrosion and let us know what you find. You can also try hooking up an external monitor to check your video output.
LED 1 indicates that trickle voltage from the power supply has been detected. This LED will be ON when the computer is turned off and your power supply is working correctly.
LED 2 indicates that the main logic board has detected proper power from the power supply when the computer is turned on. This LED will be ON when the computer is turned on and the power supply is working correctly.
LED 3 indicates that the computer and the LCD display are communicating. This LED will be ON when the computer is turned on and video signal is being generated.
LED 4 lights only if the computer detects an over-temperature condition. This LED will be OFF when the computer is turned on and running at the correct temperature.
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