AFnord: With every game, do you mean all the games in the 6-pack or all the games in the series in general? Or is it just all the M&M6-engine games that are giving you trouble?
minmark: Thx for your reply, I mean this situation shows in every game from gog( I just only have games from gog). I don't know why. Before this, I think i have changed the LCD (built in notebook w500) I changed this from Samsung to LG LCD. Does it make sense to cause this problem?
What type of games is it that you have on GOG? If it is dosbox-only games (check the shortcut, if the "target" (I think it is called) reads x:\"install dir"\DOSBOX, then the problem is probably dosbox related.
If it is with all older games, then it might be that your monitor does not support certain resolutions at all (but it would be odd if a monitor does not support 640*480 or 800*600, which were common default resolutions for games from the late 90's)