everytime i start bf42 the screen reports No connection ?, it a flat wide screen, turns itself off, u hear tho eveything running, in the back ground just the moni goes off, now with the old big Cube monitor, we didnt have that problem ?, just withthis moni ?

I'm having the same sort of problem. With the new monitor I can hear the game, but not see it. Also, when you turn the monitor off and on while the game is running, you see the screen for a split second before it turns black.

I tried changing the files in the settings, as others have suggested, but that did not work. Any help, please?

Sounds like its having that common 16:9 problem.
I fixed this on my monitor by adding a line in the start command, but forgot where it was online. search bf1942 problems with WIDESCREEN and you will find it.

The way to resolve this is to right click on the Shortcut to bf1942, choose properties and by the target area you must add +menu 1 +widescreen 1

so the target after you add this should look like this:
"C:\Program Files\EA GAMES\Battlefield 1942\BF1942.exe" +menu 1 +widescreen 1