Extra Display with ARD

When I login to one of my clients (Powerbook G4) via ARD, it has two displays which show in ARD. They are not evident when the machine is being used as a standalone. This has the effect of hiding windows etc. I have partly solved it from a user perspective by mirroring but want to get rid of the extra display. Am trying to reset NVRAM etc, but need to do it from afar.
Any other thoughts.
Thanks

I just tried this with my 12" G4 Powerbook.
I set up a second display, and then controlled it using Remote Desktop on my iMac. While ARD was active, I removed the second display and noticed that the application windows I had on the second display did not move to the main display, and I could still move my mouse to the second monitor. The only way I could see the "phantom" display was via Screen Sharing or ARD.
Luckily, a simple reboot with the display disconnected seems to have resolved the issue (no resetting of NVRAM is necessary).
Going the other direction (ie, removing a display from the imac, which is running SnowLeopard), seemed to work fine. After I removed the second display the windows moved to the main display and ARD displayed the correct window.
Hope this helps,
-Tim

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