Custom Resolution Problem ! Please Help !!

[ToastyX]

The E1720NRX is a 1280x1024 monitor. I don't know how you got it working before or what settings you used. 2560x2048 is a high resolution that requires a lot of bandwidth.

If you were sending the resolution to the monitor and the monitor was downscaling, then you need to use the "CVT reduced blank" timing standard to fit 2560x2048 within the VGA pixel clock limit.

If the GPU was downscaling, then you need to enable GPU scaling and use the timing parameters for 1280x1024 while setting the display mode to the higher resolution.