Dell Laptop e6410 ; Screen not working

I have a Dell laptop (e6410), but when I turned it on the screen is blank.  Installed Windows 7 OS, Restarted, only displays on 2nd display, device manager shows all devices working ok. (The screen was working for the first few days while I was setting it up.)

Switching output between projector and laptop screen or external screen has no effect. Nether has windows key + p.
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rindiConnect With a Mentor Commented:
Is the laptop display recognized in Device Manager? If not, you can try opening the case to check if all cables are still properly connected. If it is, you either will need to replace the display (usually an expensive option), or if you can just make out an image on the display, the inverter (usually a cheap replacement, but if it uses an LED backlight, then there is no inverter).
Zaheer IqbalTechnical Assurance & ImplementationCommented:
Do you see anything on screen when you first boot up ?
Does the screen stop working once windows is fully loaded ?
web_trackerConnect With a Mentor Commented:
Hi if it works fine on an external monitor, it could be the inverter or the screen. I trick I have used in the past is to shine  a flash light on the screen if you can see the windows desktop faintly then it could be the backlight.  If you still get nothing then the problem is most likely the screen or the cable the connects the screen to the motherboard. Do you get any video when on the laptop screen when the computer first boots?
unrealone1Author Commented:
We get a flash on the real screen for a second then it turns blank and will only display on the secondary screen.
rindiConnect With a Mentor Commented:
That would point towards inverter/backlight problems. Is the internal display shown in device-management?
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