Upgraded from 10.5 to 10.6 now monitor doens't work at all.

With 10.5 my Samsung monitor works perfect. Once I upgrade to 10.6 Snow Leopard, it no longer works at all. And I mean LITERALLY. I get a floating error message ""Not Optimum Mode, Recommended Mode: 1920 x 1080 60hz" and I can no longer use the monitor AT ALL. What the **** is going on here?

Some updates:
http://support.apple.com/kb/DL956
http://support.apple.com/kb/DL734
https://discussions.apple.com/thread/1754907
http://support.apple.com/kb/HT2838
lhttp://www.apple.com/support/imac/intel//
Read ALL carefully.
Jst to trying to help.
SJP

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