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I have a workstation with two monitors and the desktop extended over them. I have a lot of applications open (generally maximized), and I have a personal preference which application is on which monitor (let's say editors on the right, data retrieval and display on the left).

I have recently upgraded to a workstation with Windows 7 and when I power off a monitor (typically when going home at the end of the day), the desktop-expand-over-monitors disables and all applications are switched to the main monitor. (Also the taskbar I keep on the left resizes to about one icon's width.)

This is highly annoying, since I now spend the first minutes of work each day switching the applications back that were on the monitor on the right.

Is there a way to prevent this? (It says no here.) Is there software I could install that can prevent this?

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In some graphics driver you can disable automatic monitor detection - see How do I fix monitor detection in Windows 7 – Robert Nov 9 '12 at 9:49
In my case it's an NVidia NVS 310, have been searching but haven't found it yet. – Stijn Sanders Nov 9 '12 at 16:31
Tried 'obstructing' pin 19 on the HDMI connectors and 'Rigorous detection' in the nvidia control panel, but doesn't work, 'Regorous detection' didn't do anything by the way except ask if I want to detect televisions or not. – Stijn Sanders Nov 21 '12 at 16:14

An alternative is setting the default resolution in the registry:


Under this location you will find all the monitors you had attached and their configuration plus two additional: On starting with "NOEDID" and one starting with "SIMULATED".

Both entries have a sub-key named "00" and inside the two values and specifying the resolution - by default 1024 and 768.

Change them to your monitors resolution. That should fix the problem.

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up vote 0 down vote accepted

In the case with my NVIDIA NVS 310, apparently you can 'force' an EDID on a DisplayPort.

  • Open the NVIDIA Control Panel (from the desktop context menu)
  • Select Workstation, View system topology
  • Next to DisplayPort (1) and (2), there's a link EDID
  • On each DisplayPort, first do Export EDID, then Load EDID

The first time there's a warning about possible damage to monitors when you get EDID's mixed up, which may not be covered by the warranty on the monitor. So don't get the EDID's mixed up!

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