Twinview with one monitor switched off

I have a setup with two monitors, one a DVI LCD, which I use as my main monitor, and an older VGA monitor, which I use only occasionally, both connected to an nvidia graphics card. They are easy to setup using nvidia-settings. The problem is I often only work with the LCD. But with the setup I have, if I reboot the machine with only the LCD turn on (and the VGA turned off but *connected*), for some reason, the number of dots per inch changes (I know this from the info provided by nvidia-settings), and the text on the screen appears distorted and smaller. Once this happens, I cannot set it back rightly unless I reboot an turn on the VGA monitor. Has anyone experienced this issue? (or has a solution?) The metamodes line of my xorg.conf is:
Option "metamodes" "CRT: 1280x1024 +0+0, DFP: 1280x1024 +1280+0"
I don't think it necessary to post xorg.conf in full, but please say so if I'm mistaken.

I am not even a Mac user, but am guessing your problem is that you have somehow changed the screen resolution to something that is incorrect for your setup.
Presumably there is someway to reset a Mac to use default settings or safe settings, possibly relating to bios use. The first result I get from a search engine is: https://support.mozilla.com/en-US/questions/772297

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Twinview with one monitor switched off

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