Laptop screen does not work

I took a toshiba P10 laptop apart to change the DC Jack, after re-assembling it the screen does not work.  It powers up just no screen.  I've checked all the connections from the screen to the motherboard and they all seem to be fine.  Could it be a problem with motherboard or the screen?  Any help would be appreciated.
jrobinson456Asked:
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jrobinson456Connect With a Mentor Author Commented:
It ended up being the motherboard.
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rindiCommented:
I yesterday had a display problem with a laptop where an external screen worked, but the internal one had just stopped working. I too the laptop and the screen apart, checked the connections, they all seemed fine. I still unattached them, then reattached them, and afterwards it worked. I suggest you also reconnect all the connections (also those within the display itself).
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jrobinson456Author Commented:
I have unattached and re-attached all the connections from the screen to the motherboard.
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rindiCommented:
Did you also open the display itself and reattach the other ends of the cables?
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jrobinson456Author Commented:
No, but I didn't touch anything inside the display itself.  But I will try that.
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rindiCommented:
The PC with a similar error I repaired yesterday hadn't been touched on the insides at all prior to the error.
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MarkCommented:
Make  sure the mall pin that depresses when the lid is closed isn't stuck. This turns off the screen if its depressed.
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MarkCommented:
sorry-->small pin <--not mall pin
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jrobinson456Author Commented:
I dont see a small male pin anywhere.
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MarkCommented:
It's possible that there is a magnetic switch in the cover that shuts of the LCD when the lid is closed. In that case it would be very difficult to get to without disassembly.
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