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

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?

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A.
A replacement logic board

B.
A replacement backlight power board

C.
A replacement LCD panel

D.
A flashlight

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