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Message: <blockquote data-quote="chscag" data-source="post: 1747956" data-attributes="member: 46727">Yes, thru an Apple TV to your TV is just as good. Since there is no line that way, it's probably a vertical line of dead pixels in the display itself. Or it could be another type of defect which shows up as a vertical line. Either way, it's a defect in the display.  Is there an Apple Store nearby?  If there is, you might want to take it on in and have them look at it and see what they say. If your iMac is still covered by Apple Care, you can have the display replaced for free.  If not covered, it could be expensive for a 27" screen replacement.I have to ask.... has your iMac ever been bumped or tipped over on its face?  Any kind of accident with it?  (Apple is going to ask the same thing, so be prepared.)  Let us know how it went or what you decide to do.</blockquote>