I just had a look at the settings and just remembered that I have to have something connected to the S-Video out to be able to change the display settings and I'm too lazy right now to move my comp to the living room right now

Well, the settings are under the tab "Displays" in the advanced display settings. There you can choose to change settings for TV (ie video out). Make sure you choose S-Video out and not Composite out (which is also an option) since the quality of composite is terrible. I don't remember exactly where to set that though

Good luck anyway