Disabling Second Display

I have an old video card installed on my machine that allowed me to connect a TV monitor for video editing. Using OS 10.2.8, the second display would only appear as a second display if I actually had an S-Video cable connected to the card. This was important to me because whenever I had the second monitor connected, video perfomance would be affected on my primary monitor. So when I wasn't using the TV monitor, I would simply disconnect the S-Video cable and my screen and my video performance would be top-notch.
I just upgraded to 10.4.3, and I noticed that there seems to be no way to disable the option of a second monitor, despite the fact that there is no S-Video cable connected to the second video card. This is causing my video to suffer on my main monitor.
Is there any way to disable the second display? I don't even want it to show up as an option.
PowerMac G4 867MHz Mac OS X (10.4.3)

I looked under each of the tabs in the Display panel (dispaly, arrangement, and color) and there is no option for detecting displays. I know for certain that there is another display detected, since it shows up in the Arrangement tab, and I can gather the windows from the second display onto the first.
The only workaround I can think of is removing my second video card. But that is inconvenient, you know? I'd rather leave it in and have it disabled until I need it, like I could do on OS 10.2.8.
Is this something that might be solved by upgrading to 10.4.5? I'm a little hestiant, based on what I've read in the forums about all the crashing and kernel panic...

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