I see a red line running vertically through my whole screen on my Mac OSx 10.9.5 3.4 Ghz i7. Any idea what it is?

I have a red line running all the way vertically through my screen. Any idea what this is.

Welcome to Apple Support Communities
Do you see it all the time? If so, it is a display or display connector issue. To be sure about this, you can connect the iMac to an external display and check that the red line also appears on it (only if you have the appropiate cables). Anyway, you should make a backup of your data and take the iMac to an Apple Store or reseller for a further diagnose.

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