External monitor on Laptop

Ok guys, I have a problem with one of my laptops. It is an HP Pavilion dv2700. I hooked up a projector the other day for my kids. I shut down normaly and now, it only works with a external monitor or projector the primary laptop monitor's backlight is on, but no picture. I view the display settings via the external monitor, It shows my primary monitor, and I have tried to configure different ratio's and extending my desktop..etc. Even my bios does not display on the primary monitor. Any suggestions? Thanks
seanb1215Asked:
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lruiz52Commented:
Turn on the laptop and hit the Fn+F4. This key combination will allow you to switch between Laptop display and External display.

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Sam SawalhiIT ConsultantCommented:
If you look on your keyboard you should see a FN key (function) and F4 press them together and that should switch VGA output to internal LCD screen.

Hope this helps!
Thank you,
Sam
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seanb1215Author Commented:
Thanks for the reply, I have tried that several times, that's how I toggle between my projector or External monitor, I just viewed the display settings to see what was going on via the external monitor..
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sjklein42Commented:
Unplug laptop, remove battery, hold down power button for 30 seconds, reinstall battery, plug in, and try again.

http://en.kioskea.net/forum/affich-54306-hp-pavilion-has-black-screen-problem
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sjklein42Commented:
It is also possible that the backlight has coincidentally failed.  Look at the screen at an angle to see if the image is there even though the light is off.

And, one person said:

My black screen problem disappeared when I began to open the screen to a wider angle before pushing the power button. If the angle of the screen to the keyboard is less than 90 degrees it appears to trigger the problem. By opening to wider than 90 degrees, the problem goes away. Once the screen is activated it doesn't matter what angle the screen is put at. The wide angle is only necessary at boot up. This leads me to believe that it is a hardware issue. This may be an easier and less violent solution to the problem than pick the thing up by the screen. Hope this helps someone.

http://en.kioskea.net/forum/affich-54306-hp-pavilion-has-black-screen-problem
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nobusCommented:
if nothing works, do a system restore ( with external display)
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seanb1215Author Commented:
Thanks guys for the replies once again. I turned on the laptop a moment ago and the primary display was a red background. If I twisted the screen a littel, the picture went away, then came back, Failing LCD Screen, sounds like? Backlight? Thanks
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nobusCommented:
here some pictures for troubleshooting bad lcd  : http://www.lcdparts.net/howto/symptom.aspx
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CallandorCommented:
You might have a bad ribbon cable connecting the screen, if moving it around changes the picture.  If it's loose, you can open it up and try reseating it.  A red background does sound like a failing backlight, though.
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WakeupSpecialist 1Commented:
According to your post on "twisting" the screen, leads me to believe that the screen itself could be failing.  If you have to "twist" it to get the picture to come in or go out....usually the screen is going out.  I've not found a way to fix that particular issue.  Other than to replace the LCD itself.
However as stated by Callandor, if the screen is reddish/pink....it very well could be a backlight issue as well.  But twisting it and the colors change or the screen refreshes, or goes black etc...most likely the screen is bad.
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seanb1215Author Commented:
Thanks guys, I replaced the lcd and it works fine, I do believe that it was the backlight, but I have bad experiences with changing them, so I just changed the whole screen.
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