This is very odd. Up until now I haven't noticed anything wrong with my 22" monitor and I've had it since Christmas. However, I noticed today that I had a nice long, horizontal scan line going up my monitor. This is also very odd because one of the reasons why I got rid of my old 17" monitor was because it had scan lines (although that had 2 thin scan lines that moved much faster and were much more visible).

The scan line that I noticed on my current monitor only appears on darker colors, such as blue and gray, and not lighter colors such as white, or the purple background of GamingW. After doing some research on scan lines, I found that apparently adjusting your refresh rate could help get rid of scan lines. Most websites suggested 60 Hertz for LCD monitors. My monitor was already configured to 60 Hertz and the only other option available is 75 Hertz. After switching to 75 Hertz the scan line went away.

The reason I am creating this topic is that I'm wondering what else can cause scan lines besides your refresh rate. Is it a problem with my monitor? If so I think it still might be under warranty and I might be able to return it. Are there any environmental causes of this?  I'm assuming my monitor will function the same at 75 Hertz, but could this somehow reduce the lifespan of my monitor?

Any answers would be great because I think this is very odd that the scan line just randomly appeared a few months after my old monitor experienced scan lines.

I am using Windows XP and all of the cables are secured. I am using a VGA cable because my video card does not support dvi cables (my monitor does, however).