[V0lt]

does the computer freeze when this happens or does everything except the monitor's picture continue normally?

if the computer freezes, then it is probably the video card at fault and not the monitor.

Also, I just noticed you posted this topic in a different forum. I'd suggest you keep it in one forum or else it will make things confusing.

 

[V0lt]

Ok, the next step in troubleshooting this would be to find a monitor you can use to test to make sure it's not the video card. If you don't experience the graphics flaw on a different monitor then it is the LCD monitor at fault.