Vertical red line on my iMac computer screen.

I have a vertical red line on my 2009 21.5 inch all-in-one iMac. I can see it on the desktop and it's also there regardless of what window or application I'm running. I'm not sure what caused it but I sure would like to know if I can get rid of it. Thanks!

Having read some related discussions after I posted (my apologies), it appears there's no solution but that I need a new display. Can I get a ballpark estimate on the cost please? BTW, the line goes only about 3/4 of the distance from the bottom of the screen to the top of the screen.

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