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Model A1311 / Mid 2010 / 3.06 & 3.2 GHz Core i3 or 3.6 GHz Core i5 Processor

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4th led light will not turn-on

I replaced my 1TB hard drive,and after replacing everything back as instructed my monitor remain black, I was advise to check the led lights associate with the operation of the computer system, there are 4 such led lights, the first three light-up when the computer is first turned-on, but the fourth led remain off, My question is , should the 4th led light-up with the remaining led lights when the computer first turn-on.?

what could cause this problem?.

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Yes it should remain ON>>

LED #4 OFF means the Computer and LCD panel are NOT communicating with each other...

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