It will turn on, but the screen does not display

I have tried unplugging the power from the back of the computer and I have tried turing the power off, turning the power on and pushing command, control, R, and P at the same time the power is coming on. I held the keys down for over a minute. The display screen does not come on and it remains blade the entire time.

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You need to look at the Where are LED lights hidden and how to reset SMU switch internally to get a better idea of where the fault lies.

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