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all modern LCDs have ONE and ONE only native screen size. since you did not tell us the model number we have to tell you maybe you are setting the wrong size. if the monitor has worked before then you are sending it the wrong signal.
Video-cards generate "primary" colours (red, green, blue), and "mix" those colours to produce millions of "secondary" colours.
First, try replacing the "data' cable between the LCD and the video-card.
Second, if your LCD works correctly when connected to some other desktop or laptop computer, then the video-card in your computer is not working properly -- not sending one of the "primary" colours to the LCD. Replace the video-card.
Most LCD monitors have a default refresh rate of 60 Hz. Older monitors also have limited resolution. Please check your display settings and ensure you're not using a refresh rate higher than 60, or a resolution higher than what it supports. If either one is the case, you're lucky the LCD still works.
some time we can see that of problem as screen convert in to voilat and green colour. it is called colour fade. assambaling parts is lose of bord and other. it can be correct by soilding by expert tech. it is more seen in old crt monitor. thanks