G4 iMac thinks an external VGA monitor is attached.

My first Mac is the 17 inch G4 iMac. I'm fairly sentimental about this machine.
The iMac running 10.4.11 thinks that there is an external VGA monitor attached to it. The iMac also assigns this "ghost VGA monitor" as the main screen. Every few minutes the screen will flicker from blue, to black and to white before resetting itself. This flickering will continue at random intervals thereafter. Under the Display settings there is no option to turn off mirroring or to arrange the screens.
Years ago I used to use one of those honking CRT Studio Displays. That thing died a long time ago though. Is there some old preferences file that could be screwing with my iMac?
I have also attempted to zap the NVRAM + PRAM. It did not solve the issue.
Any suggestions would be greatly appreciated. Thanks!

I don't think there is a way to undo the firmware update, until the installer from the developer has an uninstall option, or there was an uninstall program included with the install program. You can download it again and see.
However, now that you have it working partially (it's acting like you have another display attached), try resetting the PRAM again. You did that as a byproduct of resetting the PMU, but things were not working +almost correctly+ at that time. This is the reset PRAM procedure.
http://support.apple.com/kb/HT1379
That might help, because some display settings are stored in PRAM, so the one that indicates a second display could be corrupted.
Also, when I changed display settings on my Mac (such as resolution or arrangement), these are the files I saw getting updated.
<home folder>/Library/Preferences/ByHost/com.apple.windowserver...plist
<home folder>/Library/Preferences/ByHost/com.apple.preference.displays...plist
<volume root>/Library/Preferences/com.apple.windowserver.plist
(There is a random-looking alphanumeric string where I put the dots - probably different for each system.)
So you might try dragging those preference files to the Desktop to let the system create new ones. Then restart. Note: The above files are for Leopard; could be different if you are using Tiger.

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