I just bought this game and the only way I can play it is if i manually change my screen's resolution to 800X600. I've tried running different command line parameters to force it to go to that resolution but none have worked. I have a 1080p wide screen LCD monitor and every time i start the game i get a screen that says "Input signal out of range" with the music from the startup menu.

My specs

Windows 7 Pro 64bit
4gb ddr2
2.8ghz AMD X2
ATI Radeon HD 5770 1gb

if i manually change my resolution to 800x600 the game will run fine but i get no cutscenes.

Please help! Thanks in advance! any more information you need just ask for it!

I don't know about the screen resolution problem, except to suggest you double-check your graphics card scaling options. Make sure that scaling is enabled, and you probably also want to make sure that "preserve aspect ratio" is enabled... that will put black bars on the sides of the image on a widescreen monitor rather than stretching the image to fit.

But I can say that your problem with the videos is probably NOT related to the resolution. Many people have reported problems with the movies in the game, and the issue is usually related to Quicktime. For example see this thread:

http://www.gog.com/en/forum/septerra_core_legacy_of_the_creator/cant_see_the_movies/page1

I know it's a little late, but if this is still an issue, try setting (or even forcing) the refresh rate to 60Hz. Many older games weren't set up for the modern ability to so freely change refresh-rates and, when changing resolutions, don't change the refresh-rate to an appropriate setting. Monitors (especially if you're using a TV as a monitor) may support a wide variety of resolutions, but the range of refresh-rates that work for any given resolution vary widely and are often limited to the old 60Hz standard (depending on the computer display standard involved).

Hope that helps you (or anyone else with a similar question). :)