^^^^^Section "Monitor" Identifier "Monitor0" VendorName "Monitor Vendor" ModelName "SylvaniaTF72" HorizSync 30.0 - 70.0 VertRefresh 50.0 - 160.0
This seems suspicious to me (I think your monitor advertized 50-75 vert refresh rates range via ddc). Try to put the same range here : 50.0 - 75.0.
HTH Bye Manu
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