TX1250ea thinks two monitors are installed

My laptop thinks that in addition to being connected to its own screen, it is also connected to second display (which it is not). The NVIDIA control panel calls this display an HDTV whereas Vista display settings calls it "Generic Non-PnP monitor on NVIDIA GeForce Go 6150". Device Manager shows two monitors - Generic Non-PnP Monitor and Generic PnP Monitor.
When starting up or resuming the computer from sleep the computer gets very confused and starts continuously switching the display between the laptop display, the non-existent display and attempting to display the same screen on both displays. Windows Presentation settings also switches itself on and off during this switching process.
I can sometimes (but not always) stop this from happening by using the NVIDIA Control Panel and telling it to use the Laptop Display only (which is very difficult as the mouse moves back to the centre of the screen on each switch). However, sometimes the computer settles on using the external non-existent display only, with a black screen on the laptop, and sometimes it settles for attempting to display the same image on both screens. In this cases, it sets the resolution to 720x480 in a tiny box in the middle of my laptop display.
I have disabled the non-pnp monitor in device manager, but this hasn't helped.
Can anyone please help?
Thanks

Hey Whitestar, This seems to have been posted a long time ago, But I signed in just to answer this question as long as you are still having the problem. But hey if anyone else comes along they'll have this answer.
If you are running windows 7 Here is the fix (I just had this same problem) but you right click your desktop and click the "screen resolution" Option, Click on the second monitor and go to the last setting, (should be the fourth dropdown box) And change it to "Remove this display" and click Apply.
There you have it, one monitor detected.

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TX1250ea thinks two monitors are installed

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