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Try connecting the NEC to a different computer, to see if it correctly accepts 1280-by-1024.
If so, then there's nothing wrong with the monitor, and the fault lies with either the video-adapter in your computer, or something messed-up with your installed copy of Windows.
Try replacing the video-adapter.
I did see a similar issue with a Gateway display, the source of the image was the screen is damaged by the cover inside the screen. Basically, the inside frame was scratching the back of the screen making the image to appear until it damages the screen enough to turn off pixels.
Another possible cause are: "burned pixels", some kind of damage (liquids inside the display), the display was hit, or something like that.
The only solution is to replace the display or use it until is breaks (but it will be quite annoying).
The only I can think of is the resolution setting that your T400 is putting out that your NEC does not like andcannot display, look at the T42 resolution when the NEC is hooked up to it and try to set it to be the same in the T400.
You need a VESA mounting plate.
The VESA Standard defines mounting interfaces, hole patterns and associated cable/power supply locations for LCD/TFT monitors.
The monitor you have has a 75mm x 75mm hole pattern as per the spec sheet below:
There are many types of bracket depending whether you want the panel flat on the wall or to be able to swivel it. You can see some example on the page below:
You need to search your location for a supplier.
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