hp mini external device resolution "not supported"

Hi
i connected the HP mini netbook to my flatscreen tv, at 600 x 400 was well supported, but when i checked the various resolutions available, there was one like 1300 x 1180 or so, so i checked it and the screen turned black showing only a "Not Supported" message.
i would like to know if there is a way to revert to original resolution.
also, when i clone or extend the display, it shows normally, but whith black borders at top and bottom, and when not connected i cant lower the resolution.
im on win xp
help!!

I think that some softwares or certain games, will set the screen resolution to 800x600. Which is not a native mode on some of those mini. I assume you are using XP, XP let's you do that. You need to go into display settings, select monitor and uncheck the "show unsupported mode" and and then set the 1024x576 resolution (may have to reboot).