Press the N key to enter LCD-integrated self-test mode when you see the message Do you see the color bars? Yes/No.The preboot computer assessment runs a series of tests on the computer.Use the arrow keys on the keyboard and select Diagnostics, and press the Enter key.Turn on the computer and tap the F12 key several times until the One Time Boot Menu appears.Carefully inspect the screen for abnormalities.The screen changes colors to black, white, red, green, and blue.Continue to hold the D key until you see the entire screen change colors.
The V+ box connects to my TV without a problem. It initially sees the signal but then keeps dropping the signal approx every 5 secs, then 'rediscovering' it and so it keeps cycling. Press and hold the D key and turn on the computer to enter the LCD built-in self-test (BIST) mode. 1 Connecting my Panasonic AX200E projector via HDMI to my Virgin V+ cable box.Ensure that the LCD screen is clean (no dust particles are on the surface of the screen).Disconnect any devices that are connected to the computer, and connect the AC Adapter (charger).When you notice screen abnormalities like flickering, distortion, clarity issues, fuzzy or blurry images, horizontal or vertical lines, color fade, running a diagnostic test on the LCD helps identify if the issue is with the LCD panel. Dell laptops have integrated diagnostic tools that can determine if the screen abnormality is an inherent problem with the LCD screen of the Dell laptop or with the video card (GPU) and computer settings.
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