Screen My netbook will only show screen display when the lid is half close down? When opened in full screen goes blank,

This is most probaby because of a loose display cable connection .As the cable runs through the hinge slot to the mainboard of the laptop, open the laptop full and try pressing carefully on the left side of the laptop near the hinges area. this should give you the display back.

You get nothing? Black? You didn't post the Make, Model of Laptop or the OS. Is the monitor broken? So here's a general idea. There is a ribbon cable that connects the monitor to the motherboard, it's on the back of the monitor. Google your Make, Model of laptop for a video on screen replacement. Check ALL graphics cables. How does it shut off the monitor when you open and close the lid? Some laptops have a tiny switch near the hinges. When the hinge is damaged, out of line, etc., it will not function properly. That's a good place to start. Take a look at this video tips: http://www.youtube.com/watch?v=2Yi6GNFcP3w

There's a sensor (LCD Lid Close Control Switch) that has gone bad. The sensor controls when the display is shown or not shown based on the position of the lcd lid.

Sounds like you screen is dying on you.

The problem is cause due to one of the following: the backlight or the display, check your monitor brightness settings. Sometimes your brightness may accidentally have been all the way turned down, resulting in a blank/dark screen. The monitor controls are on the keyboard, directly above the numeric keys.
Look closely at your laptop's screen if the steps do not restore power to it and if it remains blank. Can you see a faint image on the screen? If so, the backlight may be off due to the LCD "lid close" detector malfunctioning. This malfunction likely happened due to the lid close switch being stuck in the "closed" position even though the lid is open. The switch is located beside the LCD's screen hinges, and tapping the switch a few times should unstick it.
Use an S-Video cable and plug your laptop up to an external monitor, such as your television set. With the laptop and TV hooked up, turn both on and see if your computer's desktop is displayed on the TV. You can also use a fifteen ( 15 )pin monitor desktop monitor by connecting it to the blue fifteen ( 15 ) connector at the side of the laptop if you cannot see anything on screen it is the display problem. If it is, your laptop's display needs to be replaced. If not, your motherboard and/or video subsystem may need to be completely removed and replaced.

keep the screen laptop open.

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"

the problem is in display...better change ur display and use it...

Go into the diplay properties, under the screen saver tab there is a button marked power, open this. Under one of the tabs there is a section that reads, when I close the lid, under this section set it as never.

your flex cable is either bad or going bad...you need to have it replaced at a qualified phone repair shop.or your screen might be going...my first guess would be the flex cable

sam !