I have two vertical columns of pixels stuck on and it's annoying. They're yellow so they're missing their blue (?) component. Has anyone had such a problem?  Is there a fix other than taking it in or applying explosives?

Though it really shouldn't matter I'm on an Intel Imac which drives a second monitor; the second monitor does not have the artifact. This is a really sore spot in an otherwise enjoyable computing environment. Thanks in advance.