Dual screen setup: How to set a primary display?

I've got an HDTV and a 30" monitor connected (the latter being at 2560x1600 resolution).
But no matter whether the TV is actually on or not, the monitor never gets to be the first display, and instead either shows the extended desktop, or when set to mirroring (whtn the TV is on) it's on HD (1920x1200) resolution.
In Windows 7 I can simply say which display is the main display.
I tried swapping cables around, but no success.
Any ideas what I could try?

Have you tried messing around with System Preferences, Displays, Arrangement?
charlie

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