Samsung SyncMaster 2243 Shows Only Black

I've just purchased a Samsung SyncMaster 2243 monitor and changed its resolution. When rebooting my Mac the monitor shows only black with an alert exactly saying: 'Non optimum mode - Optimum mode 1920x1080 60Hz'.
The point is that I have no chance to go and change the resolution, because the monitor won't show other than black. I tried to restart from the system DVD pressing the C key on restart but with still the same result.
Don't really know what else to do. Can anyone eventually help me from out there?
By the way, I must say (and this is the strange part of all) that the first three or four times I switched my Mac on, after the advice the monitor showed, I could see my desktop and operate normally.
Thank you in advance
Giovanni

I would connect it to another monitor that I knew will work, once at the DT I would go to system preferences and set the display to a setting I know will work, say 1024x768, shut down my mac, connect the samsung and start. If you have a graphics card that has duel video ports and connect both up and set the video settings that way.
Does the samsung have a menu that allows monitor settings that can be changed?

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