Mode not supported

one day mac mini working fine connected to Samsung LCD at all resolutions, next day get mode not supported. called samsung, said to play with the resolution setting, which meant that each time I had to disconnect and connect to my 17in computer monitor tried all resolutions with no luck. At start-up apple screen with spinning wheel show on LCD panel but then as it is about to show desktop I get a black screen with message Mode not supported. Any I ideas, it was working perfectly from the the get go without any adjustment basically plug and play.

Here is the standard Apple article that addresses this type of issue.
http://support.apple.com/kb/TS2213?viewlocale=en_US

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