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OK. Great idea to try another monitor! What you forgot was to tell us the make and model. Also we need the make and model of what you're connecting the monitor to.
That said, it could be the cable and connectors: are you using an adapter to match up with a specific connector?
It could be a resolution setting on the monitor or on the video card. Both have menus for adjusting the input signals.
If possible, try your monitor with another PC; this sounds more like a video processor problem than a monitor unless you are using it in the VGA-analog mode, then, you could have a bad video cable.
The smear can be caused by improper termination and that can come from a failed ground or shield.
Generally speaking, the kind of effect you describe can't happen with a digital interface; they cause the coarse pixelation one sometimes sees on TV sets too.
Horizontal lines that look like streaks or smears, you need consider:
1) video card memory error cause it if the display memory on the video card
2) check RAM (clean pins and slot pin)
3) monitor power on without cable to see the menu display, it is ok if no streak, need to clean monitor cable plug.
this is purely a monitor issue it has nothing to do with the drivers in windows. there is likely damaged boards in the monitor itself hard to say what with the description you give. need to be serviced in a shop
Make sure your VGA cable is seated properly. If it is seated OK, it could be the start of a problem with a backlight. When a backlight goes bad, it typically shows up as pink/red color where white should be displayed.
Sounds like an inverter problem. If the power supply is internal replace the capacitors coming out of the voltage regulators. These are usually 1000mf and/or 470mf. If that doesn't do the trick look up the numbers on the 8-pin chips that drive the secondary transformers on the inverter to see if they are getting the right voltages. Good Luck!