External 1080 monitor quit working

recently, my mid 2007 macbook with OSX 10.6.8 quit properly driving my external monitor at 1920 x 1080. (I use the vga input and the error message on the monitor is invalid format.) It still works at 1024 x 768. the monitor is a Vizio M221NV.  I have a second M221NV monitor and the macbook  won't work with that one any longer either.
please help me figure out what changed and how to fix it.
Thanks

I still have the problem.
In System Preferences -> Display,  the monitor is correctly identified and the appropriate resolutions are listed.
Does anyone have any other suggestions?
Thanks

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