Use only external display on laptop

[csnplt]

I just got a new 22 inch screen yesterday, the LG L227WTG-PF. It was $60 off at Best Buy, down from $310 to $250. BTW, for anyone considering buying, this is an amazing monitor. Colors seem accurate, even before calibration. And at $250, it is a steal.

But here is my question:

In Windows XP, it is very easy to use only the external monitor, and shut off the screen on my laptop. I want to do this because I have the Intel GMA 950, and I am getting low frame rates on expose, dashboard, or spaces. Anyway, in Windows, I just open the Intel driver program, and select the option for use only external display.

However, in Leopard 10.5.4, I see only an option to mirror displays and an arrangement diagram in the arrangement tab of the display system preference pane. How can I turn off my laptop's internal screen, using only the external screen. I can't close my laptop, because I don't have an external keyboard or mouse.

Thanks for your help in advance.

 

[drichards]

You need an external keyboard and mouse for that, so you can close the macbook.

 

[csnplt]

You need an external keyboard and mouse for that, so you can close the macbook.

The must be another way. By the way, if I close my laptop, the screen doesn't go off. I don't have a macbook.

 

[drichards]

On a late macbook pro F7 is a display mode toggle. You can switch between mirrored, ext-off, and ext-only I think. You need that to work on your... Dellintosh I guess?

See what F7 does either way. I just read a thing that suggested it didn't work, but who the hell knows with a hackintosh.