If adding custom resolutions isn't working, here's a surefire way to add 1280x720 and also 1920x1080 into your list of resolutions with a nvidia and 2405 combo. Note that these are not actually custom resolutions, therefore they will both be displayed correctly in 16:9 using the 2405's monitor scaling (custom resolutions like 1280x800 must be nvidia scaled to maintain aspect ratio). Just do this:
1) Make sure you have the latest series 90 forceware drivers with the new control panel
2) Find the nvidia setting that says "this digital display is an HDTV" or "treat as HDTV" or whatever and turn it ON
3) Now go into the "TV and video" settings and you'll see a list of HD signals. First, select 720p and press apply. The monitor will be set to 1280x720 60Hz and this setting (in all color modes) will be permanently added to your list
4) Now select 1080p and click apply (DO NOT select 1080i). 1920x1080 59Hz will be permanently added to your list
5) Now go back and UNcheck the box that says "treat as HDTV"
Now you have 1280x720 and 1920x1080 added to your list as if they were always there. All color modes should be supported, monitor scaling should be supported (i prefer the 2405's scaling over nvidia's since it seems to maintain deeper blacks, noticeable in text), and all games that support native widescreen like Half-Life 2, Oblivion, and World of Warcraft should now show these resolutions in-game.
I have a 7800GTX and a 2405, but nvidia's drivers should act the same way. Though I get to play games at 1920 so I don't really have to worry about it (except Oblivion, which I have to play at 1280x720 if I want to keep ultra high settings).
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