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GDubyaDubya

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11825

November 13th, 2014 19:00

laptop screen does not display without external monitor

Tried (and sometimes successful) to connect HDTV to laptop, Inspiron 5720.  Now laptop screen does not display (goes black) without an external monitor physically attached. Tried using Projects and clicking on single laptop display, but if I disconnect the external monitor, the laptop screen just goes black.  Not very portable if I have to lug around a second display.

DELL-Ravi Ch

7 Technologist

 • 

7.1K Posts

November 13th, 2014 22:00

Hi GDubyaDubya,

It seems like an issue with LCD screen or LCD cable as the system is working with external monitor. Please follow the steps mentioned below to run the “LCD BIST’ to confirm the issue.

  1. Turn of the computer.
  2. Press and hold down the ‘D’ key on the keyboard and press the Power button.
  3. You will see different colors on the LCD screen. Please check if the issue reoccurs on the screen.

Also, consider remove and reseating the LCD screen cable on the system.

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