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RE: [Need urgent help] Dell latitude e6420 screen blank

I'd suggest you run LCD Built-in Self Test (BIST) to check the screen itself. Please hold down the D key and press the power button. Release them both, and this should begin the BIST test. You should see colored bars appear on the screen, it should ask if you saw them. Select NO to begin the test.

How to Run the Laptop LCD Built-in Self Test | Dell US

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