I've just installed Windows 7 on my Dell machine. Everything works fine except that there are one or two lines on the screen. The line is so random and I am sure that it's now the monitor problem. The graphic card is NVidia GeForce 7600. I replaced the default driver with the driver from the manufacturer and it didn't help.
When I change screen setting, the line goes away for a while and it comes back in different location. Sometimes an app window has the line and if I move the window the line follows with the window.
What can I do to fix it?