ScummVm full screen problems

[Renzor]

well ive had this problem for a while now whenever i try to run a game in scummVM fullscreen my pc monitor says imput not supported although i coud hear the sound but no image comes out and sometimes it does show in full screen but the image is all cropped i never had this problem with monkey island in DOS format but i have it with the scummVM fullscreen. the only solution is when the game boots and the message saying imput not suppoted i press alt+enter for windowed mode any suggestions?

[Agozer]

Choose another fullscreen resolution.

[Renzor]

hmm it works full screen with correct ratio setting but it still looks weird well at least it fixed my problem thanks