HP DV6701ca laptop display only works when external monitor connected

I have a laptop whose display only seems to come on when an external monitor is plugged into the side VGA port. I'm running Vista by the way. When I unplug the external monitor, the display turns off for a second, comes back on for a second and then finally off. You can also hear the Vista ker-clunk, ker-clunk a few times as if it's detected a change in video.

Just for fun, I brought up the Nvidia control panel and set it to laptop display (had the external hooked up of course). I unplugged the external monitor and waited 10 or so seconds while the laptop did it's thing. The screen is now black and I plugged in the external monitor. Nvidia briefly showed the display as analogue before showing laptop display 5 seconds later as it switched over. I did hook up an svideo cable to my flat screen and Nvidia shows that as TV. So I'm not sure what this analogue display thing is about.

Any ideas? Thanks.

I could always youtube what I'm seeing.
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Waterloo_PORTAsked:
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Waterloo_PORTConnect With a Mentor Author Commented:
I got the problem fixed the same day I posted. I apologize for not posting this fact right away.

It's tough to explain exactly what I did to fix to problem but in the end the Nvidia control panel was able to remember that my laptop was the primary display no matter whether an external device was plugged in or not. It may have had something to do with the combination of dual display vs extended desktop settings and which screen was the primary. I'm pretty sure the problem was on the Nvidia control panel side.

Thanks for your suggestions though.
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rindiCommented:
Check for a function key combination (on most laptops it's Fn+F7) to change from external to internal Display. Also check within the BIOS, there may be a setting there too with which to select the main display.
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steveoskhCommented:
Vista had issues with hibernat/sleep modes and the laptop display.  Coming out of sleep the display would not work at all but an external one would.  This is different than you describe but sounds like it might be related.
You could try deleting the display from the hardware profile and allowing windows to 're-find it".
The sleep issues were solved with the Vista Service Pack.  Have you installed it?
I would patch Vista and then get any patches from HP.  
Actually for HP, I would start with the web support chat http://www.hp.com/go/ispe   
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