Notebook uses external monitor as default

March 26, 2011 at 02:49:33
Specs: Windows XP
The other day I (again) hooked the notebook to our projector, but after that time the notebook seems to think that the external monitor is its own display: During boot there is image on the notebook display, but soon after login to XP, it disappears or dims into almost nothing.

I guess it's a Windows setting that should be changed. But where?

In Display/Properties/Settings both screens are identified as "1". And yes, I am used to switch between the screens with (in this case) ALT+F7.

I'd be grateful for advice, especially if you have tried something like this before. The experiences in the net with "dim" screen are typically targeting hardware problems.

Best regards, Søren

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March 26, 2011 at 05:27:20
I would go into Device Manager & look under Monitors.

Probably delete the projector entry, if it is there & start again.

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March 26, 2011 at 08:30:05
I'm now working on a "real" (Acer) external monitor; don't think the projector is really the problem. It's more like I forgot to Fn+F7 away from the external monitor setting, and some wrong setting got stored.

But anyway I tried deleting all three Monitors/Generic television (no "Projector") found. No change. But thanks anyway, Johnw. And now they are back in the device manager again.

The notebook display (now) goes blank already between "Windows Starting Up" and XP login screen. I can get an image in it by Fn+F7. Not 100% sure if that's a change or just me remembering wrong in my first post.

OK then, now I did the "Extend the desktop to this monitor" and got the external monitor to be "2". I change to Notebook display only. After about 1m25s it goes very dim. Image is like 95% gone. Any clue?

Are there some settings for the graphics card, which could/should be changed?

Best regards, Søren

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March 26, 2011 at 14:59:42
Try Safe mode Device Manager > Monitors.
Right click on the notebook one & select > Properties > General, down the bottom you have Device usage, select > Use this device (enable)
Now check the external monitor and make sure it is disabled. Click OK. Exit out and reboot.

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March 29, 2011 at 01:02:10
Thanks for the advice. In safe mode, there were no Monitors in the Device Manager.

In normal mode, all were enabled; I disabled them and nothing changed. I deleted them and nothing changed.

I am wondering if the lamp is just worn out and therefore starts but sets out after about 1½ minutes.

Regards, Søren

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