Dell Inspiron N7110 display issue

Hi,

I have a Dell Inspiron N7110.  When I boot it the display lights up (ie the backlight) but there is no data or images. If I then plug in an external monitor the boot screen for Windows 7 shows on the external device and it works fine, but the laptop display just goes dark as soon as I plug in the external display. If I reboot with the external display connected neither display come on (the laptop display backlight comes on), but if I disconnect the external display and reconnect it, the external display then shows the normal boot screens and Windows 7 etc.  I've tried a different panel in the laptop with the same result. The cable to the display looks good.   Is there a chance that it could be to do with detecting the lid being open or closed?  Can't find a switch for this.  Any ideas would be greatly appreciated.

Thanks,

Clive
clive_struverAsked:
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CallandorConnect With a Mentor Commented:
>If I reboot with the external display connected neither display come on (the laptop display backlight comes on), but if I disconnect the external display and reconnect it, the external display then shows the normal boot screens and Windows 7 etc.

It doesn't sound like the switch, or this would not work.  It sounds like there is something wrong with the internal circuit that detects whether an external display is connected.  Unfortunately, to fix that, you have to replace the motherboard.
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Scott ThompsonConnect With a Mentor Computer Technician / OwnerCommented:
That does sound odd.  When you say a different panel, are you talking a different LED screen?  I would start off by updating the BIOS.  According to the Dell Website, it fixes the following issues...
"1.To fix lid function failed in DOS. \u000a2.Modify fan max speed value to fix WBDD tool fan.exe test failed if system in high temperature\u000a3.Added LED test interface for factory"

You can download that here...
http://www.dell.com/support/drivers/us/en/19/DriverDetails/Product/inspiron-17?driverId=7NJ55&osCode=ww1&fileId=2902708289
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clive_struverAuthor Commented:
Thanks,
I'll try the bios update, and yes, I have a replacement led screen which I tried, and same result.  Do you think it could be the cable, even though the backlight works?

Clive
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Scott ThompsonComputer Technician / OwnerCommented:
I have seen where it has been the cable, since with new LED screens versus CCFL, the power to light up the screen goes directly through the LCD Cable to the screen.  Let me know what you find out.
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nobusConnect With a Mentor Commented:
it can be they don't talk about the lid switch - on many laptops it is fixed on the mobo, and can't be repalced easily then

here the service manual, if needed for inspection  http://support.dell.com/support/edocs/systems/insN7110/en/sm/index.htm
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clive_struverAuthor Commented:
Thanks for all your advice, unfortunately I think it is the motherboard having tried all other suggestions.
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