Which of the following should you use first to isolate as either a backlight issue or a video signal issue?

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Francine states that she does not see anything on her iMac display when she turns it on.
Which of the following should you use first to isolate as either a backlight issue or a video
signal issue?

A.
A replacement logic board

B.
A replacement backlight power board

C.
A replacement LCD panel

D.
A flashlight

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