Thin blue line on iMac screen

Sounds like this might be a graphics card issue. Does it show up in screenshots?

 

If you take a screenshot, does the image display the line as well, or is it clean?

 

Press command+shift+3. The image should appear as a file called "Picture 1" or "Picture 1.png" on your desktop.

 

Does the blue line show up when your computer is booting up, like at the Apple logo screen?

 

Does it show up if you boot to another drive as well, like your computer's install disks?

 

On the iMac, I believe so. On further reflection, the blue line sounds more like a display than graphics card issue. Is it still in warranty?

 

That happen to my imac g5...it started out this thin yellowish line *vertical* on my screen. When I took a screen shot it can out clean. Went to take a look at it, it was the screen..Had to replace it *not under warranty anymore* My mom nearly payed $600 to fix..It was heart breaking..