Mirrored my imac temporarily to my video projector now can't get imac screen back to standard viewing (shows as if a side monitor is added)

   I recently mirrored my imac to project some videos.  I now want to return my imac to regular use and standard screen presentation but find it remains in the mode as if i have an external monitor connected to it with the monitor on the right side.  My imac screen only shows roughly 2/3 of the image, as if there is another monitor connected to the right side.  I've disconnected the projector, tried turning mirroring off, searching for displays, putting the computer to sleep.  I keep getting this same visual set up.
  Thanks for any assistance.

Thank you Malcolm for the response. An excellent idea which I hadn't tried.
I actually had zapped the PRAM several times (and even reset PMU) but did not think to do it with the DVI->VGA adaptor removed, so I just tried this. Unfortunately this didn't solve it. After removing the DVI-> VGA adaptor from port 2 and zapping PRAM (twice), I now am getting an "unsupported input" message on the monitor connected to Port 1 with the DVI->VGA adaptor still removed from port 2. So if anything this state is worse.
This is very strange--because when I put the DVI adaptor back on port 2, the situation returns to where it was before as described. After a hardware reboot I have the aqua screen with missing login window again. It seems zapping the PRAM did not do it here. It also seems this DVI->VGA adaptor is definitely having an effect on the situation. Why would connecting a DVI-VGA adaptor on port two cause port one to regain function and why would removing it cause port 2 to go dead essentially?
At any rate, I am still unable to use the computer...

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