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My monitor does the same thing at times and sometimes shows "No Signal" and at other times the screen will maintain the images but the backgound color switches to mustard yellow. In each of these cases I have been able to solve the problem by unplugging the power cord from the electical outlet for about three seconds and plugging it back in. I have a KDS model 780 LCD.
Have you checked your video card or adapter?
Check the settings on the monitor itself.
If you didn't find the problem go into system properties (windows logo + pause)/hardware/device manager. Expand monitor/right click and see if your new monitor is listed. Is there a yellow or red symbol next to it? This would mean a problem, then right click symbol/properties and error will be shown.
Could be a memory issue.
Don't forget to try a "working monitor". This will narrow it down a bit.