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Laptop Display only works when plugged in to an external monitor...

The laptop display works!


When I start up my laptop, you can see the cycling on the laptop screen without it plugged into an external source.

However, when it's time to log in, if the laptop is not plugged into an external source the screen sits there black/gray (but noticeably on).

When I plug it into an external monitor via HDMI cable, the laptop display comes on and so does the external display monitor. The laptop display is display number 1 and hosts the main desktop.  However, when I disconnect the HDMI cable from the laptop, even if on the Nvidia control panel it is selected as the main source, the laptop display disappears again and the screen goes black.

I've tried everything I know how to do, does anyone else have a clue?
(It also does this when I boot it into safe mode)
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cjcotton
Asked:
cjcotton
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1 Solution
 
jonahzonaCommented:
It sounds like your laptop display may have been changed from the primary display.

Plug it into the secondary display, go to your display properties on the laptop.

Make sure when you click on the laptop display that the checkbox marked "use as primary display" is checked.
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danielmarkoCommented:
Simple things that have worked for me in the past are.
A)      Clear memory
a.      Turn off the laptop.
b.      Unplug
c.      remove the battery
d.      wait for 20 min
e.      test
B)      Create a new hardware profile
a.      For an XP system
b.      http://support.microsoft.com/kb/308577
c)      Create a new hardware profile
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danielmarkoCommented:
Oh what kind of laptop is it?
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cjcottonAuthor Commented:
@jonah: I've already verified this. Laptop Display is #1 and it is marked as primary.

@Daniel: I will try this, the computer is a Latitude E6510. I just updated the BIOS, but that didn't work. I'll try both of yours and see.
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cjcottonAuthor Commented:
So... none of these worked. As a result of frustration, I just went into the Device Manager and uninstalled the driver and then reinstalled it after the restart. That fixed it.
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jonahzonaCommented:
LOL. Always the last place you look.

Glad you found it.
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cjcottonAuthor Commented:
Haha, I should have tried this earlier, but I had convinced myself there must be another way -- I even updated the driver. I swear, Nvidia Control Panel makes me /sadface sometimes.
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cjcottonAuthor Commented:
None of the other comments worked and while I continued to work on it, I created my own solution and it worked.
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