Has any body have used SDL librabries,what are the possible reasons for SDL_SetVideoMode returning NULL ?

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1

Has any body have used SDL librabries,what are the possible reasons
for SDL_SetVideoMode returning NULL SW_Surface ?

2

Has any body have used SDL librabries,what are the possible reasons
for SDL_SetVideoMode returning NULL SW_Surface ?

http://sdl.beuc.net/sdl.wiki/SDL_SetVideoMode

3

Thanks,got it the display was not initialised.