Dell Inspiron 3700 - Manual (Page 44)

13. Click the display that is grayed out. When asked if you want to enable this display, click Yes, and then click Apply.
If You Have Display Problems
If your computer is receiving power, but nothing appears on your display (such as light, text, or graphics) or the display image does not appear as
you would expect, try the following measures to resolve the problem:
1. If the display is blank, you may be in standby mode. Press the power button to resume from standby mode. If the display is blank and the
power light-emitting diode (LED) is on, the display may have timed out. In this case, press any key on the keyboard to resume normal
operation.
2. If the low-battery light is blinking, connect the AC adapter to the computer or replace the battery.
3. Adjust the brightness.
4. If your computer is attached to an external monitor, press <Fn><F8> to switch the video image to the display.
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NOTE: True Simul-mode (the ability to simultaneously display video of the same content and resolution on both the computer display
screen and the external display) is not supported if the system is booted to MS-DOS, using a full-screen MS-DOS session under a
Microsoft Windows operating system, or the ATI Mobility M1 video driver is not loaded. This limitation may also be noted in operating
systems other than Microsoft Windows.