You need to change the pc power settings, so closing the lid does not turn off the computer.
Open the Power settings by clicking on the battery icon in the bottom right hand of the screen.
Save the settings and it will stay on until you press the power key to turn it off.
SOURCE: D800 laptop will not display on external monitor
Most laptops go into standby mode when the lid is closed. To stop this, (Windows XP) click Start, Control Panel, Performance and Maintenance, Power Options, then click on the Advanced tab, select "Do nothing" in the drop-down for "When I close the lid of my portable computer"
SOURCE: the laptop screen is almost blank/black. an
As per Dell Technical support LCD kit needs to be Replaced.
I Would recommend to
Run PSA Diagnostics. Check for PSA Error codes
if unable see display during PSA Diagnostics use External monitor to make note of Error code.
Check Error code on support.dell.com
If no Error codes. Then Only option is replace LCD kit
SOURCE: While at home I plug a wide screen monitor into my
You appear to be cloning your internal LCD and as long as it is active, the resolution setting for the LCD is also controlling the resolution of the external monitor. When the LCD is closed, then the default resolution of the external monitor is being used by Windows 7 (It apparently has autodetected the size of the monitor and knows the Highest optimal resolution it will display.) The higher the resolution, then smaller the icons.
To resolve, go to display properties and check the resolution of the internal LCD and then set the External display to the lower resolution.
You should be able to wake the system with an external keyboard, by pressing the spacebar, if the system is sleeping
Testimonial: "Thanks, my LCD Problem is fixed. I have an external keyboard and mouse connected by USB but neither one will wake the computer from sleep. "
SOURCE: How can I "Keep Alive" the video out put to an
If you have Windows 7, click the start button and select Control Panel, then select "power options". In the left margin select "change when the computer sleeps". In the next box select "change advanced power settings". In the advanced power options box look for "power button and lid" and click the plus box next to it and change your settings. Make sure to click "apply" after changing the settings or it won't take.
Xp and Vista will be similar. In all cases you want to go into Control Panel and select power options.
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