Display prefs showing extra display when none are connected

I have a MacBook Pro and when I go to the display preferences it shows another display when no monitor is connected. I have searched the web extensively for a fix and haven't found anyone with the same problem. I'd prefer to just delete some obscure system file within OS X rather than reinstalling the whole OS just to fix the problem.
Anyone know of an easy way to get rid of the mysterious extra display?
Thanks,
Adam

I've just been reading this in the hope that my problem will be solved but realised that my problem is similar almost in reverse!
I have a Pioneer tv which I connected to my MBP several months ago using the MPB>mini DVI>DVI>HDMI cable route ... and all worked fine.
Today, when I connect the same items no luck. The only thing that happens is a brief flash of solid blue screen on MBP. I've tried all the resolution change tricks etc and no luck ... but here is the weird bit:
Even though I cannot get it to work, my MBP always shows "Gather Displays" as an option ... even when no display/cable connected ... if you click the ? button it suggests this button should only be available when more than one display is connected. Clicking it (or Detect Displays) does nothing.
So, my MBP seems convinced I have another display connected but won't let me see or use it. I don't even have the Arrangement tabs etc.
Any ideas?
Thanks in advance for any ideas!!

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Display prefs showing extra display when none are connected

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