Can't remove second display with 8800 GT. please help! this is frustrating!

I have dealt with this problem for a long time now, but having just bought a wacom tablet, I need to finally resolve it and I hope someone here can help because I am at my end with it. I just can't think of anything else.
I have a 8800 GT video card in a Mac Pro. All software is updated.
I have a 30inch apple cinema display, and was using it solo for a long time, then for a project, I hooked an old LCD monitor vida the VGA to DVI adapter to the second monitor slot on the card, and had both monitors running in the extended desktop mode. Everything worked fine.
The problem is, now that I want to get rid of the other monitor, my cinema display does not want to run solo anymore. I have tried rebooting with only the cinema display plugged in, I have tried switching ports on the card (both with and without rebooting), and I have tried unplugging the unwanted monitor. When I do ANY of these, the cinema display goes blue, then black, and the light on the front blinks three times over and over.
It is as tho the video card does not want to autodetect the displays, nor does it want to reset any settings and run without both monitors in extended mode. And since OSX does not give specific software for the video card, I am limited in displays to make any real changes. There is no option for turning off extended desktop, only mirroring the displays (which, yes, when I choose it then unplug the other display results in the same problem of no picture).
My wacom tablet uses the tablet as being the screen from corner to corner, so obviously with the extended display, the center of the tablet is not the center of the monitor and it makes it impossible to use easily.
Please, if anyone has any ideas for me, I am begging for help. This is frustrating to no end!!
Thanks in advance.

Buzz,
thanks for the help. I especially want to thank you for being the first person to reply a post of mine on this subject ever (on multiple help boards as well).
Unfortunately what you told me to do still didn't work.
When I re-mirror and then un-mirror the displays it puts it back into extended mode. and when I unplug the second monitor, the HD display shuts down and goes black. it will not turn back on (even with a reboot) until I have something plugged into the other port, at which time it goes back to extended mode.
This is really frustrating, and the first time I have felt helpless with my mac. I try support and they of course tell me they can not help me since the monitor's extended warranty ran out...even tho the computer's warranty is still up and this is of course a video card problem, not monitor.
I'm about to give up and either reinstall EVERYTHING on this **** computer (which will result in me losing a lot of editing add-ons and other programs I bought but stupidly can't remember where I got them from) or just throw the whole thing in the trash. (heh yes, I am that frustrated). :/

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